Objective: To perfect the data of fauna and geographical distribution of black flies in Liaoning province.

目的：对辽宁省进行蚋类补点调查，完善辽宁省蚋类区系资料。

youdao

It's named Soot because it's so black, an' it hops an' flies about with him everywhere.

它叫煤灰，因为它太黑了，它跟着他到处跳，到处飞。

youdao

Flies rose in thick black swarms.

苍蝇黑压压地成群飞起。

《牛津词典》

After decades of study, BTI has been shown to affect almost exclusively black flies.

NPR: Waging a One-Woman War Against Black Flies

Ms. MALIK: People want the black flies controlled, and this is the best method.

NPR: Waging a One-Woman War Against Black Flies

Just when the snow is gone and the sun is warming things up, the black flies appear.

NPR: Waging a One-Woman War Against Black Flies