シャドーイング練習: Cambridge 16 IELTS Reading Test 4 Passage 1 - 動画で英語スピーキングを学ぶ

レッスンを作成中...
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Cambridge 16, IELTS Reading Test 4.
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Passage 1.
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Roman Tunnels.
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The Romans, who once controlled areas of Europe, North Africa, and Asia Minor, adopted the construction techniques of other civilizations to build tunnels in their territories.
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The Persians, who lived in present-day Iran, were one of the first civilizations to build tunnels that provided a reliable supply of water to human settlements in dry areas.
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In the early 1st millennium BCE, they introduced the Canet method of tunnel construction, which consisted of placing posts over a hill in a straight line to ensure
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that the tunnel kept to its root and then digging vertical shafts down into the ground at regular intervals.
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Underground, workers removed the air from between the ends of the shafts, creating a tunnel.
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The excavated soil was taken up to the surface using the shafts, which also provided ventilation during the work.
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Once the tunnel was completed, it allowed water to flow from the top of a hillside down towards a canal, which supplied water for human use.
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Remarkably, some canets built by the persians 2 700 years ago
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are still in use today they later passed on their knowledge
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to the romans who also used the cannet method to construct
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water supply tunnels for agriculture roman cannet tunnels were constructed with vertical shafts dug at intervals of between 30
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and 60 meters the shafts were equipped with handholds
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and footholds to help those climbing in and out of them and were covered with a wooden or stone lid.
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To ensure that the shafts were vertical, Romans hung a plumb line from a rod placed across the top of each shaft
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and made sure that the weight at the end of it hung in the center of the shaft.
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Plumb lines were also used to measure the depth of the shaft and to determine the slope of the tunnel.
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The 5.6 kilometer long Claudius tunnel, built in 41 CE to drain the Fusine Lake in central Italy,
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had shafts that were up to 122 meters deep, took 11 years to build and involved approximately 30,000 workers.
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By the 6th century BCE, a second method of tunnel construction appeared called the counter-excavation method,
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in which the tunnel was constructed from both ends.
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It was used to cut through high mountains when the Kanat method was not a practical alternative.
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This method required greater planning and advanced knowledge of surveying, mathematics and geometry as both ends of a tunnel had to meet correctly at the center of the mountain.
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Adjustments to the direction of the tunnel also had to be made whenever builders encountered geological problems
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or when it deviated from its set path.
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They constantly checked the tunnel's advancing direction, for example, by looking back at the light that penetrated through the tunnel mouth, and make corrections whenever necessary.
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Large deviations could happen, and they could result in one end of the tunnel not being usable.
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An inscription written on the side of a 428-meter tunnel built
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by the Romans as part of the Salve aqueduct system in
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modern-day Algeria describes how the two teams of builders missed each other in the mountain
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and how the later construction of lateral link between both corridors corrected the initial error.
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The Romans dug tunnels for their roads using the counter-excavation method whenever they encountered obstacles such as hills
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or mountains that were too high for roads to pass over.
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An example is the 37-meter-long, 6-meter-high, Furlopass tunnel built in Italy in 69-79 CE.
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Remarkably, a modern road still uses this tunnel today.
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Tunnels were also built for mineral extraction.
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Miners would locate a mineral vein and then pursue it with shafts and tunnels underground.
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Traces of such tunnels used to mine gold can still be found at the Dolokoti mines in Wales.
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When the sole purpose of a tunnel was mineral extraction, construction required less planning, as the tunnel route was determined by the mineral vein.
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Roman tunnel projects were carefully planned and carried out.
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The length of time it took to construct a tunnel depended on the method being used
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and the type of rock being excavated.
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The Canet construction method was usually faster than the counter excavation method as it was more straightforward.
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This was because the mountain could be excavated not only from the tunnel mouths but also from shafts.
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The type of rock could also influence construction times.
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When the rock was hard,
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このレッスンの語彙とスピーキングのポイント

このB2レベルのスピーキングレッスンは、動画「Cambridge 16 IELTS Reading Test 4 Passage 1」を教材にしています。 繰り返し出てくる語は次のとおりです：tunnel, shaft, method, roman, construction。 この動画には、シャドーイング用の文が48文、単語が731語あります。 音声の長さは4:40です。 話す速さは1分あたり約157語で、日常会話に近い自然なペースです。 英語の頻出3,000語に含まれる単語は75%だけなので、語彙は難しめです。

この動画の重要語彙

動画の中で特に難しい単語15語を、発音と意味つきで紹介します。

単語発音意味
construct 動詞/ˈkɑn.stɹʌkt/建設する, 建てる
mineral 名詞/ˈmɪn.ə.ɹəl/鉱物
metre 名詞/ˈmiːtəɹ/メートル, ㍍
vertical 形容詞/ˈvɝ.tɪ.kəl/垂直の, 縦の
plum 名詞/plʌm/暗紫色, セイヨウスモモ
vein 名詞/veɪn/静脈
interval 名詞/ˈɪntɚvəl/間隔
builder 名詞/ˈbɪl.dəɹ/建設者
civilization 名詞/ˌsɪv.ɪ.laɪˈzeɪ.ʃən/文明
meter 名詞/ˈmitəɹ/メーター, 計量器
aqueduct 名詞/ˈæk.wəˌdʌkt/水道橋
deviate 動詞/ˈdiː.vi.eɪt/逸れる
deviation 名詞/ˌdiː.viˈeɪʃən/偏差
kilometre 名詞/kɪˈlɑmɪtəɹ/キロメートル
equip 動詞/ɪˈkwɪp/装着

動画に出てくる句動詞

単語発音意味
carry out 動詞/ˈkæ.ɹi aʊt/行う, 実行する

注意したい発音

  • 「sh」と「zh」の音: shaft /ˈʃɑːft/, excavation /ˌɛkskəˈveɪʃn/, extraction /ɪkˈstɹækʃən/, civilization /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/, deviation /ˌdiː.viˈeɪʃən/
  • 長い単語（アクセントの位置に注意）: remarkably /ɹɪˈmɑɹkəbli/, civilization /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/, deviation /ˌdiː.viˈeɪʃən/, kilometre /kɪˈlɑmɪtəɹ/, ventilation /ˌvɛntɪˈleɪʃ(ə)n/

日本語話者が苦手な音：

  • /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: mineral /ˈmɪn.ə.ɹəl/, remarkably /ɹɪˈmɑɹkəbli/, builder /ˈbɪl.dəɹ/, kilometre /kɪˈlɑmɪtəɹ/, lateral /ˈlætəɹəl/
  • /v/ — /b/ にならないように、上の歯を下唇に当てる: excavate /ˈɛk.skə.veɪt/, excavation /ˌɛkskəˈveɪʃn/, vertical /ˈvɝ.tɪ.kəl/, vein /veɪn/, interval /ˈɪntɚvəl/
  • /f/ — 「フ」ではなく、上の歯と下唇で出す: shaft /ˈʃɑːft/, foothold /ˈfʊthoʊld/, straightforward /ˌstɹeɪtˈfɔː(ɹ)wə(ɹ)d/

この動画での練習方法

  1. まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
  2. まず0.75倍速で一文ずつシャドーイングし、慣れてきたら通常の速度に戻します。
  3. 自分の声を録音して元の音声と比べます。construct, mineral, metreなどの単語に特に注意しましょう。

シャドーイングとは？英語上達に効果的な理由

シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。

シャドーイングのやり方: ステップ別の完全ガイドを読む →