History follows a tortuous course.

历史的进程是曲折的。

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The cuboidal cells often extend valve-like cytoplasmic processes which give the channels a tortuous course.

立方形间皮细胞常伸出瓣膜状胞质突起，使腹膜下小管呈蜿蜒曲折状。

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A review of these 3 years shows that we have traversed a tortuous course and that our achievements are hard won.

回首这三年，我们走过的道路很不平坦，成绩来之不易。 收藏。

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