シャドーイング練習: The surprisingly long history of electric cars - Daniel Sperling and Gil Tal - YouTubeで英語スピーキングを学ぶ
C1
シャドーイング コントロール
0% 完了 (0/38 文)
If you were buying a car in 1899, you would’ve had three major options to choose from.
⏸ 一時停止中
再生速度:
リピート回数:
待機モード:
字幕同期:0ms
すべての文
38 文
1
If you were buying a car in 1899, you would’ve had three major options to choose from.
2
You could buy a steam-powered car.
3
Typically relying on gas-powered boilers, these could drive as far as you wanted— provided you also wanted to lug around extra water to refuel and didn’t mind waiting 30 minutes for your engine to heat up.
4
Alternatively, you could buy a car powered by gasoline.
5
However, the internal combustion engines in these models required dangerous hand-cranking to start and emitted loud noises and foul-smelling exhaust while driving.
6
So your best bet was probably option number three: a battery-powered electric vehicle.
7
These cars were quick to start, clean and quiet to run, and if you lived somewhere with access to electricity, easy to refuel overnight.
8
If this seems like an easy choice, you're not alone.
9
By the end of the 19th century, nearly 40% of American cars were electric.
10
In cities with early electric systems, battery-powered cars were a popular and reliable alternative to their occasionally explosive competitors.
11
But electric vehicles had one major problem— batteries.
12
Early car batteries were expensive and inefficient.
13
Many inventors, including Thomas Edison, tried to build batteries that stored more electricity.
14
Others even built exchange stations in urban areas to swap out dead batteries for charged ones.
15
But these measures weren’t enough to allow electric vehicles to make long trips.
16
And at over twice the price of a gas-powered car, many couldn’t afford these luxury items.
17
At the same time, oil discoveries lowered the price of gasoline, and new advances made internal combustion engines more appealing.
18
Electric starters removed the need for hand-cranking, mufflers made engines quieter and rubber engine mounts reduced vibration.
19
In 1908, Ford released the Model T; a cheap, high-quality gas-powered car that captured the public imagination.
20
By 1915, the percentage of electric cars on the road had plummeted.
21
For the next 55 years, internal combustion engines ruled the roads.
22
Aside from some special-purpose vehicles, electric cars were nowhere to be found.
23
However, in the 1970s, the tide began to turn.
24
US concerns about oil availability renewed interest in alternative energy sources.
25
And studies in the 1980s linking car emissions with smog in cities like Los Angeles encouraged governments and environmental organizations to reconsider electric vehicles.
26
At this point, car companies had spent decades investing in internal combustion engines without devoting any resources to solving the century-old battery problem.
27
But other companies were developing increasingly efficient batteries to power a new wave of portable electronics.
28
By the 1990s, energy dense nickel metal hydride batteries were on the market, soon followed by lithium-ion batteries.
29
Alongside regulatory mandates by California to reduce smog, these innovations sparked a small wave of new electric vehicles, including hybrid cars.
30
Hybrids aren’t true electric vehicles; their nickel metal hydride batteries are only used to optimize the efficiency of gas-burning engines.
31
But in 2008, Tesla Motors went further, grabbing the attention of consumers, automakers, and regulators with its lithium-ion-powered Roadster.
32
This purely electric vehicle could travel more than 320 kilometers on a single charge, almost doubling the previous record.
33
Since then, electric vehicles have vastly improved in cost, performance, efficiency, and availability.
34
They can accelerate much faster than gas-powered sports cars, and while some models still have a high upfront cost, they reliably save their drivers money in the long run.
35
As governments around the world focus on slowing climate change, electric vehicles are now expected to replace gas-powered ones altogether.
36
In Norway, 75% of car sales in 2020 were plug-in electric vehicles.
37
And policies such as California’s Zero Emission Vehicle mandate and Europe’s aggressive CO2 emission standards have dramatically slowed investments in gas-powered vehicles worldwide.
38
Soon, electric cars will reclaim their place on the road, putting gasoline in our rearview.
Shadowing English
モバイルデバイスで利用できるようになりました。今すぐダウンロード！
5.0
このレッスンについて
「The surprisingly long history of electric cars - Daniel Sperling and Gil Tal」を使って、シャドーイングで英語を練習しましょう。
毎日15〜30分の練習で、IELTSスピーキングへの自信と実践的な英会話力が身につきます。
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。