热带雨林只占地表的一小部分，大约是6%，但它的树木种类比世界上任何其他地区都多。

Rainforests make up only a small part of the Earth's surface, about six percent, but there are more kinds of trees than any other area in the whole world.

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全部33名被困在地下69天的矿工终于回到了地表。

All 33 trapped miners made it back to the surface after 69 days underground.

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在钻孔技术发达的今天，打通地下隧道已经不会伤及地表了。

Drilling technology has improved, allowing tunnels to be dug without breaking the surface.

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Hal is behaving in exactly the way you would expect him to behave, or it to behave, if it felt fear.

哈尔准确地表现出你所期望他,或称为它,理应表现的行为方式,如果它确实感到恐惧的话

耶鲁公开课 - 死亡课程节选

And, seawater contains only 3.7% of the total magnesium present 7% in the Earth's crust.

而海水只含有,地表镁总量的,3。

麻省理工公开课 - 固态化学导论课程节选

This tells you exactly what you want.

它清楚地表明了你的目的

耶鲁公开课 - 基础物理课程节选