操纵列表的有两类函数：构造函数和选择函数。

Two types of functions manipulate lists: constructors and selectors.

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纵列显示的是变量（如 图3所示）。

The variables are the columns ( Figure 3).

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然后主要从双丝或多丝电弧焊工艺和双焊炬组合焊接工艺两个大的方面着重介绍了纵列式熔化极气体保护焊、等离子弧-熔化极气体保护焊和双电极熔化极气体保护焊等高速弧焊工艺。

Then, high-speed arc welding processes are introduced, such as tandem GMAW, PAW-GMAW and DE-GMAW, based on two categories:twin or more wires arc welding process and two-torch combined welding process.

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He was used to working with cards and putting things in rows and columns by suit.

他曾经玩纸牌,来将它们用纵列和横列的排列出来。

麻省理工公开课 - 固态化学导论课程节选