丙二烯是甲基乙炔的一种异构体。

Allene is an isomer of methyl acetylene.

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因此，优质乙炔的选用就显得尤为重要。

Therefore, high-quality selection of acetylene it is particularly important.

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使用重量（不是压力）来确定钢瓶内乙炔的数量。

Weight (not pressure) is used to determine the amount of acetylene in a cylinder.

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So let's take the case of acetylene where we have two carbon atoms that are going to be triple bonded to each other, each are bonded to a carbon and then to one hydrogen.

让我们来看一看乙炔的例子,我们有两个碳原子,成三键，每个碳和一个碳一个氢相连。

麻省理工公开课 - 化学原理课程节选