为了测量两极之间的高程差，测量员在两极中间的一个水平基座上使用了光学水准望远镜。
To measure the difference in elevation between poles, surveyors used an optical level—a telescope on a level base—placed halfway between the poles.
这本书甚至没有达到废话的水平和白痴的水准。
This book doesn't even reach the level of nonsense, of idiocy.
三年级时，事情已经变得很清晰，他的智力水平无法在读写方面超出初级的水准，于是他从此离开了学校。
He left school in the third grade, when it became clear that he'd never be able to read or write beyond an elementary level.
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