But they betray themselves _________ they open their mouths.

但是，他们每次开口说话时都会暴露自己。

youdao

But they betray themselves every_time they open their mouths.

但他们每次开口说话就会露馅。

youdao

In so doing, they betray an appalling lack of seriousness in confronting one of the century's most pressing problems.

允许这种情况发生，在应对本世纪最为迫切的一个问题中他们暴露出令人震惊缺乏认真对待的迹象。

youdao

Like gill slits, which derive ultimately from mammals' fishy ancestors, they betray a watery phase in elephantine evolution.

ECONOMIST: The elephant and the mermaid

Driven by their technocratic ideology, they betray their own credo of sticking to the facts, and that's bad enough.

CNN: Human stem cell cloning: 'Holy Grail' or techno-fantasy?

That's the sadness they get before they quit or before they betray.

NPR: Robert Jordan, Hemingway's Bipartisan Hero