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イーロン・マスクさんのインタビューを聞いて、内容を理解します。

Take Japan, for example, I think... I'm just going off memory here, but I think(the) population is roughly 110 million

but last year, if you take the number of children born times the life expectancy, which is 85 years-it's very impressive... life expectancy

then Japan would have, I think, around 68 million people, roughly half of the current population.

That does not tell the full story because those... that... you would have an upside-down demographic pyramid. You already have an upside-down demographic pyramid.

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【アニメで英語】チェンソーマン「キミの願い事 なんでも一つ叶えてあげる」マキマ【ネイティブ英語が聞き取れる】【リアルな英文法・英会話】【毎日リスニング#151】

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