英语和汉语分别属于两种不同的语系，在词的构成、词形变化、句法结构和词序等均存在很大差异。

English and Chinese belong to different language families, and great disparity exists in word formation, sentence structure, and word order.

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学习外语会将你的注意力集中在语言结构本身：语法，词形变化和句子结构。

Learning a foreign language draws your focus to the mechanics of language: grammar, conjugations, and sentence structure.

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并从重力场反映的地壳结构、地壳形变、地壳应力状态、地壳活动性诸方面，论述了各构造区的特征。

He describes features of tectonic regions, including crustal structure, crustal deformation, stress field and crustal activity.

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