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Stars 101 | National Geographic

National Geographic · 3,341,524 次观看 · 添加于 2 个月前

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B1

CEFR 等级

5/10

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字幕 (50 片段)

00:00

- [Narrator] Like fireflies on a still summer night,

00:03

they gently dot and illuminate the infinite velveteen sky.

00:12

Stars.

00:14

Be they millions or billions of years old,

00:17

are all born in nebuli, clouds of dust

00:20

and mostly hydrogen gas.

00:23

Within these stellar nurseries,

00:25

stars begin life as protostars

00:27

or hot cores formed by the collection

00:30

and collapse of dust and gas.

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