Let's have a look at some of these mandatory titles.

让我们来看一看一些命令式的标题。

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You have to take collision insurance; it's mandatory.

你必须要买碰撞保险，这是规定的。

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The sender may have left out a mandatory element.

发送方可能漏掉了一个强制性的元素。

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The sender may have left out a mandatory element.

发送方可能漏掉了一个强制性的元素。

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