跟讀練習: How a Car Engine Works - 通過影片學習英語口語
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67 句
如果句子過短或過長，請點選 Edit 進行調整。
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I'm Jake O 'Neill, creator of Animagraphs, and this is how a car engine works.
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Let's start at a single piston, the powerhouse of the engine, and work our way outwards.
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The four -stroke cycle.
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When a piston travels to the end of its range, whether up or down, that's a stroke.
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Car engines use a four -stroke cycle, and it goes like this.
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First, intake.
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The piston descends, sucking an air -fuel mixture into the cylinder through the intake port, with both intake valves open.
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Next, compression.
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With all valves closed, the piston comes back up, compressing the fuel and air mixture for more powerful combustion.
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Then, the power stroke.
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An electrical spark ignites the compressed fuel and air mixture, and the resulting combustion forces the piston to the bottom of the cylinder again.
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A connecting rod transfers this power to the crankshaft.
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Finally, exhaust.
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The piston comes back up, pushing the spent mixture out through open exhaust valves and the exhaust port.
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Connecting multiple pistons.
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For smooth power delivery, pistons take turns firing.
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The firing order for this engine is 1, 3, 4, 2.
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Cam shafts with specially shaped cams push spring -loaded valves open in turn.
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Cam gears and a timing belt or chain links everything to the crankshaft and it all spins together.
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The crankshaft translates piston power out of the engine.
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It has counterweights to balance against the pistons for perfectly smooth revolutions.
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This is what RPM means.
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We're counting the number of full crankshaft revolutions per minute.
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The engine block holds the crankshaft and cylinders.
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and the cylinder head holds valves,
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ports, cams, etc. A geared flywheel sits at one side of the crankshaft for connection to a transmission.
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It's also where the starter connects to the system.
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This engine has four cylinders arranged in a single row, but there are many other possible configurations,
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like six cylinders with three on each side, angled in a V -shape, or eight.
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Despite different design goals, the basic engine parts are all there.
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Now let's look at other systems that support this combustion process.
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Air intake.
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Air comes in through the air filter, and then into the intake manifold,
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where it mixes with fuel before being sucked into individual cylinders through intake ports.
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Fuel.
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The fuel pump carries gas from the tank through a fuel filter to the engine,
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where fuel injectors emit a precisely timed spray of gas into the intake port.
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Cooling.
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Engines get very hot during operation and require a cooling system.
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Coolant channels around the cylinders
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and through the cylinder heads carry a special liquid called antifreeze to keep temperatures within safe operating range.
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It's called antifreeze because it won't freeze in icy weather.
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After cooling hot engine parts, coolant circulates through the radiator.
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The radiator has a network of small tubes and fins.
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Coolant passes through these channels while air, pulled in by the radiator fan,
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blows by the tubes, cooling the hot liquid for recirculation.
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A water pump keeps the coolant system flowing and properly pressurized.
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The thermostat regulates coolant temperature by either routing coolant back through the engine or to the radiator for further cooling.
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Electrical The spark plug delivers the electrical spark that ignites the fuel -air mixture for combustion.
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The metal core is insulated from the outer metal casing with porcelain.
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The spark jumps between these conductive surfaces.
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The coil pack delivers electrical current to the spark plugs.
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As directed by the ECM, or Engine Control Module, the ECM is a computer that directs many core engine functions like spark timing,
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valve open and close timing, air to fuel ratio, etc. The alternator works like a power generator,
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converting the engine's mechanical energy into electricity to charge the battery or run other electrical systems while the engine is running.
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The battery provides power to the starter for engine start.
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Motor oil is used to lubricate, clean, prevent corrosion, improve sealing, and cool the engine by carrying heat away from moving parts.
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Rings around the top of the piston head keep oil out of the combustion process, while otherwise allowing the cylinder to be lubricated.
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Oil galleries are channels through the engine block and cylinder head that carry oil to various engine parts.
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Oil flows through the engine and back to the oil pan for recirculation.
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Oil rests in the oil pan when not in circulation.
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The oil pump keeps oil properly pressurized and flowing, and the oil filter keeps oil clean from contaminants.
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Exhaust The exhaust manifold collects gases from multiple cylinders into one pipe.
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Exhaust flows through the catalytic converter, which captures toxic chemicals in engine exhaust.
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And then out through a muffler that reduces exhaust noise.
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And finally, here's the full functioning engine with all the basic systems we've discussed.
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Thank you.
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本課的詞彙與口語要點
這節口語課以影片“How a Car Engine Works”為素材。 影片中反覆出現的詞有：engine, oil, cylinder, piston, fuel。 這段影片共有 38 個句子、790 個單詞可供跟讀。 講話部分時長為 7:44。 說話人語速較慢，每分鐘約 102 個詞，你有足夠的時間模仿每一個音。 只有 67% 的單詞屬於英語最常用的 3,000 詞，詞彙難度較高。
影片中的重點詞彙
影片中 15 個值得學習的單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| cylinder 名詞 | /ˈsɪləndɚ/ | 圓柱體 /圓柱體, 圓柱 /圓柱 |
| exhaust 動詞 | /ɪɡˈzɔst/ | 抽完 |
| intake 名詞 | /ˈɪnteɪk/ | 攝取量 /攝取量 |
| valve 名詞 | /ˈvælv/ | 閥門 /閥門 |
| spark 名詞 | /ˈspɑɹk/ | 火花 |
| mixture 名詞 | /ˈmɪkst͡ʃɚ/ | 混合 |
| combustion 名詞 | /kəmˈbʌs.t͡ʃən/ | 燃燒 /燃燒 |
| connect 動詞 | /kəˈnɛkt/ | 連線 /連線 |
| filter 名詞 | /ˈfɪltɚ/ | 過濾器 /過濾器, 濾過器 /濾過器 |
| pump 名詞 | /pʌmp/ | 泵, 唧筒 |
| freeze 動詞 | /ˈfɹiːz/ | 凍結 /凍結, 凍 /凍 |
| suck 動詞 | /sʌk/ | 吸吮, 咂 |
| smooth 形容詞 | /smuːð/ | 平穩 /平穩, 順利 /順利 |
| liquid 名詞 | /ˈlɪk.wɪd/ | 液體 /液體, 液態 /液態 |
| tube 名詞 | /tuːb/ | 筒 |
需要注意的發音
說話人用了 4 次縮略和弱讀形式，例如 I'm, we're, we've。請按聽到的簡短形式來說。
- “th” 音: smooth /smuːð/, thermostat /ˈθɝməstæt/
- “sh” 和 “zh” 音: capture /ˈkæp.(t)ʃɚ/, ratio /ˈɹeɪ.ʃoʊ/, transmission /tɹænsˈmɪʃən/, specially /ˈspɛʃəli/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/
- 長單詞——注意重音位置: electrical /ɪˈlɛktɹɪkəl/, electricity /ɪˌlɛkˈtɹɪsɪti/, mechanical /məˈkænəkəl/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/, circulation /ˌsɝkjʊˈleɪʃən/
中文母語者容易讀錯的音：
- /v/ — 不要讀成 /w/，上齒輕觸下唇: valve /ˈvælv/, convert /kənˈvɝt/, conductive /kənˈdʌktɪv/, converter /kənˈvɜɹtɜɹ/
- 詞尾子音 — 要讀清楚，後面不要加母音: exhaust /ɪɡˈzɔst/, intake /ˈɪnteɪk/, valve /ˈvælv/, spark /ˈspɑɹk/, connect /kəˈnɛkt/
- /r/ 和 /l/ 的區別: electrical /ɪˈlɛktɹɪkəl/, electricity /ɪˌlɛkˈtɹɪsɪti/, precisely /pɹɪˈsaɪs.li/, translate /tɹænzˈleɪt/, regulate /ˈɹɛɡ.jə.leɪt/
如何用這段影片練習
- 先完整聽一遍影片，不要開口，記下不認識的單詞。
- 用正常速度逐句跟讀，每句重複到你的節奏與說話人一致為止。
- 錄下自己的聲音並與原聲對比，特別注意 cylinder, exhaust, intake 這類單詞。
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。