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動画の字幕をクリックしてすぐ単語の意味を調べられます!
単語帳読み込み中…
字幕の修正報告
The number of smart phone users globally
is set to reach 2.5 billion by 2019.
Around a third of the world's population will own one.
Smartphones touch every element of our lives.
But did you know that they also connect nearly every
element on the planet?
In fact, of the 118 elements on the periodic table,
75 can be found inside a smartphone.
These raw materials are extracted from the ground
and shipped to refineries and factories
in a truly global supply chain.
Silicon.
One of the most common elements in the earth's crust,
is used to make the billions of transistors in the chips
that power your phone.
Gold is used for electrical wiring.
About 0.03 grams of it in each iPhone.
Indium, another metal, is used to make touch screens.
But when it comes to batteries,
lithium is one of the key components,
and this element is only mined in a handful of countries.
Until recently, Chile used to produce the most lithium.
But now Australia has the biggest market share.
The Democratic Republic of Congo,
a dangerously unstable country
with a poor human rights record,
produces more than half the world's cobalt,
another crucial element in smartphone batteries.
Smartphone makers are under pressure to ensure their cobalt
is responsibly sourced.
About 80% of the cobalt used in batteries
is refined in China.
Many so-called rare-earth elements
are also used in smartphones,
in the screen, the speaker,
and the motor that makes your phone vibrate.
About 85% of rare-earth elements are produced in China.
Despite their name, rare-earth elements
are not particularly rare,
but they are hard to extract
without producing toxic and radioactive byproducts.
Many of the elements used in smartphones
are finite resources,
and have no functional substitutes.
Rather than digging in the ground for the elements needed
for new handsets,
it makes sense to extract them from old phones.
But only about 10% of handsets are recycled now.
So recycle your phone if you get a new one this year.
Why? It is, you might say, elementary.
コツ:単語をクリックしてすぐ意味を調べられます!

読み込み中…

Where does your phone come from? | The Economist

4217 タグ追加 保存
Priscilla 2018 年 10 月 12 日 に公開
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  1. 1. クリック一つで単語を検索

    右側のスプリクトの単語をクリックするだけで即座に意味が検索できます。

  2. 2. リピート機能

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  3. 3. ショートカット

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  4. 4. 字幕の表示/非表示

    日・英のボタンをクリックすることで自由に字幕のオンオフを切り替えられます。

  5. 5. 動画をブログ等でシェア

    コードを貼り付けてVoiceTubeの動画再生プレーヤーをブログ等でシェアすることが出来ます!

  6. 6. 全画面再生

    左側の矢印をクリックすることで全画面で再生できるようになります。

  1. クイズ付き動画

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  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔