シャドーイング練習: How 3D Printing Is Transforming The Auto Industry - 動画で英語スピーキングを学ぶ

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3D printing.
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It's a technology that's been around for decades, but is now increasingly being used by automakers to cut costs and save time.
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Both the technology and the business cases have gotten stronger, enough to start installing machines in auto factories.
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Automakers like Ford and Rivian are using 3D printing for prototypes, specialized tools, and even replacement parts.
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Also known as additive manufacturing 3d printing builds an object from
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a digital design adding material layer by layer depending on the machine
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that material can be plastic ceramic or even something harder like metal
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or carbon fiber composite rivian says
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it has spent more than five million dollars on these types of machines materials for the operations
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now cost about 1 .7 million per year
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At the company's
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Michigan Research and Development Center, smaller printers sit alongside industrial machines that can cost hundreds of thousands of dollars.
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They make prototypes for design and testing, including electric motors, steering wheels, and other interior parts.
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Rivian told CNBC the machines typically pay for themselves within a year just by saving on supplier tooling and logistics, and of course, time saved.
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It's a similar story at Ford.
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The company has increasingly used 3D printing as its factories.
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At the River Rouge plant, where the automaker builds its crucial F -150 pickup truck, about two dozen printers produce thousands of tools,
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including hood holders, torque bit sockets, and tools for smoothing adhesive.
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When one of Ford's plants needed a large machining wheel to keep its operations going,
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the company printed a temporary replacement while it waited for the production and delivery from a supplier.
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Mercedes -Benz, Toyota and even EV startup
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Slate also use 3D printing in their operations as well.
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General Motors has even started using 3D printed parts for some
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of its low -volume Cadillac vehicles such as a medallion on
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a manual gear shifter marking the technology's growth from prototyping to production parts.
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Executives believe the future for 3D printing like the parts
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they build is limitless as machines continue to come down in cost and efficiency increases.
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This is a production of WGBH.

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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

このスピーキングレッスンは、動画「How 3D Printing Is Transforming The Auto Industry」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：printing, machine, parts, cost, automaker。 この動画には、シャドーイング用の文が28文、単語が350語あります。 音声の長さは2:27です。 話す速さは1分あたり約143語で安定しており、シャドーイングしやすいペースです。 英語の頻出3,000語に含まれる単語は71%だけなので、語彙は難しめです。

この動画の重要語彙

動画に出てくる覚えておきたい単語15語を、発音と意味つきで紹介します。

単語発音意味
prototype 名詞/ˈpɹəʊtətaɪp/プロトタイプ, 原型
replacement 名詞/ɹɪˈpleɪsmənt/代替
layer 名詞/ˈleɪ̯ɚ/層, 膜
printer 名詞/ˈpɹɪntɚ/印刷者
supplier 名詞/səˈplaɪə/サプライヤー, 供給者
temporary 形容詞/ˈtɛmp(əˌɹ)ɛɹi/暫くの, 暫時の
alongside/əˌlɔŋˈsaɪd/に沿って
smooth 形容詞/smuːð/スムース
efficiency 名詞/ɪˈfɪʃ.ən.si/効率性, 効率
manual 名詞/ˈmæn.j(u)əl/手引き, 説明書
hood 名詞/hʊd/フード, 頭巾
depend 動詞/dɪˈpɛnd/依存する
install 動詞/ɪnˈstɔl/導入する, インストールする
logistics 名詞/ləˈd͡ʒɪstɪks/物流, 運送
startup 名詞/ˈstɑɹtˌʌp/スタートアップ, ベンチャー

この動画の文法

話し手がよく使っている文型を、動画の実際の表現とともに紹介します。

文型動画での表現
現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係しているthat's been · have gotten · has spent
動詞 + -ing enjoy, keep, stop… + -ing — 後ろに-ing形が続く動詞start installing · started using
現在進行形 am/is/are + -ing — 今まさに、または最近起きていることis now increasingly being · are using

注意したい発音

  • 「sh」と「zh」の音: efficiency /ɪˈfɪʃ.ən.si/, crucial /ˈkɹuː.ʃəl/, specialize /ˈspɛʃəˌlaɪz/
  • 長い単語（アクセントの位置に注意）: temporary /ˈtɛmp(əˌɹ)ɛɹi/, efficiency /ɪˈfɪʃ.ən.si/

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: replacement /ɹɪˈpleɪsmənt/, crucial /ˈkɹuː.ʃəl/
  • /v/ — /b/ にならないように、上の歯を下唇に当てる: additive /ˈæd.ɪ.tɪv/, adhesive /ədˈhiː.sɪv/
  • /f/ — 「フ」ではなく、上の歯と下唇で出す: efficiency /ɪˈfɪʃ.ən.si/, fiber /ˈfaɪ.bɚ/

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. 通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
  3. 自分の声を録音して元の音声と比べます。prototype, replacement, layer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 →