是以由引入段、切削段、锥杆段和扭力段组成的丝锥组成的。

The torque force section is changed to a regular hexagonal prism from a regular quadrangular prism.

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本产品主要适用于隧道的：引入段、过渡段、基本段、出口段。

This product is mainly applicable to the tunnel: entrance section, change-over portion, basic segment and exit section.

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通常，代码库也引入处理多个版本或者并行地表现不同发布版本的同一段代码流的挑战。

Often, code bases also introduce the challenge of working on multiple versions or streams of the same code that represent different release versions in parallel.

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Well, this shows what happened in the period after this vaccine was introduced into the general population so that would have been in 1954.

这表明了,疫苗在一九五四年,引入大众后的一段时间内,发生了什么样的情况

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