跟讀練習: PCB Assembly: Low Volume vs. High Volume - 通過影片學習英語口語
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32 句
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One of the first questions to ask when evaluating a PCB assembly contract manufacturer is can they handle the expected production volume?
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To answer that, we first have to understand what we mean by low, mid, and high volumes.
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For this video, we'll leave aside very high -volume consumer electronics,
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and consider more typical volumes done by US -based contract manufacturers like Z -Axis.
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Buyers of SMT printed circuit boards often consider volume in terms of boards per year, but that doesn't tell us what we need to know.
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A contract manufacturer thinks in terms of numbers of parts to be placed.
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This is
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because the speed of the SMT pick -and -place machines is
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generally the limiting factor in how fast a job can be completed.
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Consider this example.
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For this job, we need to produce 50 boards.
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For this job, we need to produce 1 ,000.
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Which is higher volume?
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This board has 1 ,800 parts, so that's a total of 90 ,000 parts in the job.
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This one has 40 parts per board for a total of 40 ,000 parts.
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We'd consider it to be a lower volume job even though it's 20 times more boards.
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One reason the number of boards doesn't give you the true picture of volume is panelization.
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For most PCB assemblies, the layout designer fits multiple boards in an array on a single substrate or panel.
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The entire panel is populated at once, and then depaneled into individual boards.
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So to produce 10 ,000 small boards, which sounds like a lot, we may need just 100 panels.
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But again, what really matters is the total number of parts in the job job.
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Now that we have a better understanding of volume, let's look at what a contract manufacturer needs in order to do low, mid, and high volumes in one factory.
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First, you need SMT lines designed for both speed and flexibility.
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These machines pick and place up to 45 ,000 parts per hour to complete high volume jobs fast, and are designed for fast changeover between jobs,
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so you can do many different lower volume jobs in a week.
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A contract manufacturer may also have a semi -automated line for lower -volume jobs, as well as new products.
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For work other than SMT assembly, we may use manual processes for low volumes and switch to robotic systems for higher volumes.
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For example, this robotic dispensing system for box builds.
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For IC programming, we can process a low volume by hand or use a robotic system for higher volumes.
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For through -hole PCB assembly and some mixed technology boards, the wave solder can handle any volume.
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For mixed technology boards that can't be wave soldered, we can do hand soldering for low volumes or robotic soldering for higher volumes.
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Visit our website to learn more about contract manufacturing of low, mid, or high volume electronic products in the USA.
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本課的詞彙與口語要點
這節口語課以影片“PCB Assembly: Low Volume vs. High Volume”為素材。 影片中反覆出現的詞有：volume, board, parts, contract, manufacturer。 這段影片共有 32 個句子、471 個單詞可供跟讀。 講話部分時長為 3:00。 說話人語速自然，每分鐘約 157 個詞，接近日常對話。 82% 的單詞屬於英語最常用的 3,000 詞，其餘的詞建議在練習前先學一下。
影片中的重點詞彙
影片中 10 個值得學習的單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| manufacturer 名詞 | /ˌmænjʊˈfæktʃəɹə/ | 製作者 /製作者, 製造者 /製造者 |
| designer 名詞 | /dɪˈzaɪnɚ/ | 設計師 /設計師, 設計家 /設計家 |
| manual 名詞 | /ˈmæn.j(u)əl/ | 手冊 /手冊 |
| electronics 名詞 | /ɪˌlɛkˈtɹɑ.nɪks/ | 電子學 /電子學 |
| layout 名詞 | /ˈleɪ.aʊt/ | 設計 /設計, 佈局 /佈局 |
| buyer 名詞 | /ˈbaɪ.əɹ/ | 買主 /買主, 購買人 /購買人 |
| evaluate 動詞 | /ɪˈvaljʊeɪt/ | 評價 /評價 |
| substrate 名詞 | /ˈsʌbˌstɹeɪt/ | 底層語言 /底層語言 |
| solder 名詞 | /ˈsɒl.də(ɹ)/ | 焊料 |
| automate 動詞 | /ˈɔ.təˌmeɪt/ | 自動化 /自動化 |
需要注意的發音
說話人用了 5 次縮略和弱讀形式，例如 doesn't, can't, we'd。請按聽到的簡短形式來說。
- 長單詞——注意重音位置: manufacturer /ˌmænjʊˈfæktʃəɹə/, electronics /ɪˌlɛkˈtɹɑ.nɪks/, flexibility /ˌflɛksɪˈbɪlɪti/
中文母語者容易讀錯的音：
- 詞尾子音 — 要讀清楚，後面不要加母音: robotic /ɹoʊˈbɑtɪk/, circuit /ˈsɝ.kɪt/, electronics /ɪˌlɛkˈtɹɑ.nɪks/, layout /ˈleɪ.aʊt/, evaluate /ɪˈvaljʊeɪt/
- /r/ 和 /l/ 的區別: electronics /ɪˌlɛkˈtɹɑ.nɪks/, solder /ˈsɒl.də(ɹ)/
- /æ/ — 嘴張大，不要讀成 /e/: manufacturer /ˌmænjʊˈfæktʃəɹə/, manual /ˈmæn.j(u)əl/
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。
- 先用 0.75 倍速逐句跟讀，熟練之後再回到正常速度。
- 錄下自己的聲音並與原聲對比，特別注意 manufacturer, designer, manual 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。