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B1 中级 韩语 4:42 Educational

Busy Beavers Build Dam Ahead of Winter | Yellowstone | BBC Earth

BBC Earth · 16,406,957 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 (25 片段)

00:15

A beaver can fell a cottonwood tree in just a few hours,

00:20

hundreds in a year.

00:27

The beaver doesn't chew through the whole trunk

00:30

just enough to make the tree unstable.

00:33

It then retreats and lets the wind do the rest.

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