They should be quick to respond to letters to the editor, lest animal rights misinformation go unchallenged and acquire a deceptive appearance of truth.

他们应该尽快回复读者来信，以免有关动物权利的错误信息大行其道，披上真理的骗人外衣。

youdao

For how shall I go up to my father, and the lad be not with me? Lest peradventure I see the evil that shall come on my father.

若童子不和我同去，我怎能上去见我父亲呢。恐怕我看见灾祸临到我父亲身上。

youdao

It is impossible to let the vacuuming go for too long, lest the bezoars (new vocabulary word) become large enough to choke a tiger.

也不可能吸尘太久，以免内袋变大到能噎死一只老虎。

youdao

When news breaks on Quora, as it did with the rumored Google Me product, traditional and online-only publications like Fortune and Gizmodo are almost compelled to jump on it, lest their readers go elsewhere to read the news.

FORBES: Quora: A Technology Writer's Best Friend, For Now

But China will never go too far, lest it lose its buffer.

FORBES: Magazine Article

Even the more moderate politicians have been forced to go along with this trend lest they be marginalized.

WSJ: Review & Outlook: Where Is Leung Chun-ying?