At dusk bats appear in vast numbers.

蝙蝠于傍晚时分大批出现。

《牛津词典》

Many more people speak Chinese—but even they, in vast numbers, are trying to learn English.

世界上最多的人说的是中文，但即使是他们，也有相当数量的群体在努力学英语。

youdao

They can "read" DNA directly and rapidly, and are cheap enough to replicate in vast Numbers.

它们能直接并快速地“读”出dna，同时足够廉价以便进行大量的重复实验。

youdao

Accessories are big business, both as entry points to brands and as easy, more affordable add-ons that can be sold in vast numbers.

WSJ: Tina Gaudoin on Style: The Hat Is On | The Top Winter Accessories

If all Hitler had done was kill people in vast numbers more efficiently than anyone else ever did, the debate over his lasting importance might end there.

CNN: The necessary evil?

Some have taken to consulting on art for airports and hotels, offering website-design advice to their peers, and talking about developing apps to sell to visitors in vast numbers, of course.

WSJ: A New Way Forward | Dan L. Monroe | Peabody Essex Museum | Cultural Conversation by Judith H. Dobrzynski