In chapter three, we mainly introduce crossbar switching.

本文第三章的主要内容是交叉开关交换。

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In chapter three, the torsional vibration of the flexible bar was analyzed.

第三章简要分析了柔性杆的扭转振动。

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In chapter three, the author explains in detail the sources of these new words.

在第三章，作者详细的解释了这些新词的来源。

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If you're unsure about that, check out, of course, chapter three in the textbook, where these issues are addressed.

当然,如果还不确定,可以看看课本的第三章,这些问题都提到了

耶鲁公开课 - 聆听音乐课程节选

Imagine reading a book and getting to a difficult passage in chapter three.

FORBES: Magazine Article

Generally, the heroine and the hero remain monogamous after they meet, regardless of whether it is in Chapter Three or Chapter Ten, however chequered their past, and no matter whether they hate each other at first sight.

ECONOMIST: America rediscovers its heartland

And that's how far we've gotten in this campaign, to chapter three.

NPR: Political Ads May Not Tell Whole Story