1、Some species gather by the thousands to form multicellular bodies that can crawl.
一些種類的黏菌千上萬個(gè)個(gè)體聚集起來，形成可以爬行的多細(xì)胞體。

2、Mullets, crabs, rays and small fish congregate by the thousands off an Alabama pier.
胭脂魚，螃蟹，鰩，小魚等聚集在數(shù)以千計(jì)的阿拉巴馬岸口。

3、Upon reaching the coast, the lemmings do not stop but swim by the thousands into the surf.
一旦到達(dá)海岸，旅鼠不會(huì)停下來，而是成千上萬地游進(jìn)海浪中。

by the thousands翻譯