youdao

You can use this approach whenever the lifetime of the mapping must be tied to the lifetime of the key.

当映射的生命周期必须与键的生命周期联系在一起时，可以使用这种方法。

youdao

Deletions are a little more complex, because we also want to delete the reverse mapping for the key we're deleting.

删除函数略微有些复杂，因为我们还想删除正在删除的键的反向映射。

youdao

Mr. Cameron seems to have done a good job of mapping and moving some of the key players as well.

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Mapping to key Firefox footprints around the globe, leading operators Deutsche Telekom, Etisalat, Smart, Sprint, Telecom Italia, Telefonica and Telenor are backing the open Firefox OS as an exciting new entrant to the smartphone marketplace.

ENGADGET: Mozilla says a slew of carriers and handset makers set to support Firefox OS

That may be good enough for mapping key signposts on chromosomes, says Venter, who recently joined the company's board.

FORBES: Technology