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二十到四十

二十到四十

二十到四十

二十到四十

1

It is suggested that you do aerobic exercise for twenty to forty minutes , three to four times a week .

建议你每周做三到四次有氧运动，每次二十到四十分钟。

2

Normally , some 20 to 40 per cent of a satellite reaches the Earth 's surface when it falls out of orbit.

通常脱轨的卫星抵达地球表面时，只剩下大约百分之二十到四十左右。

3

Did you know that a leaking toilet can waste twenty to forty litres of water an hour ?

你知道一个漏水马桶一小时浪费二十到四十公升水吗？

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