Flies rose in thick black swarms.

苍蝇黑压压地成群飞起。

《牛津词典》

Any of various small, biting, two-winged flies, such as a punkie or black fly.

蚊，蚋一种小的咬人的双翼飞蝇，如咬人小飞虫或黑蚊。

youdao

Any of various small, biting, two-winged flies, such as a punkie or black fly.

蚊，蚋一种小的咬人的双翼飞蝇，如咬人小飞虫或黑蚊。

youdao