如果你在寻找中间价位的，我认为，价值30到60美元之间的任何礼物都是不错的选择。
If you are looking for something priced in the middle, I would say anything between $30 and $60 would make a decent gift.
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.
它们在个人和基于非个人关系的较大的“二级”机构之间形成了一个中间的社会层次。
They form an intermediate social level between the individual and larger "secondary" institutions based on impersonal relationships.
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