This element should be present as a subelement of the fwd or rev element.

这个元素应该作为 fwd 元素或 rev 元素的子元素出现。

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If a FWD element that contains one or more via elements is present, the receiver should remove and inspect the top via subelement of FWD and verify that it is the intended recipient of the message.

如果出现了包含一个或多个via元素的fwd元素，接收方应该删除并检查fwd元素的第一个via子元素，并验证它是不是消息意想中的接收方。

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This receiver will become the ultimate destination when (1) there are no via elements listed in the FWD element after the removal of the top via element, and (2) there is no to element.

当(1)删除第一个via元素后fwd元素中不列有via元素，以及(2)没有to元素的时候，这个接收方将变成最终目的地。

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Zuckerberg is launching a lobbying outfit called FWD.us to call for more high-skilled immigration, starting with a Washington Post op-ed.

FORBES: How To Argue For More High-Skilled Immigration