As if to underline the horror,the place is infested by vast swarms of flies.更为恐怖的是大量的苍蝇聚集于此

as if犹如，好像，好似，仿佛

He walked along as if favoring his sore foot.

他走路像是特别小心照顾他那只酸痛的脚似的。

I felt as if my heart would burst with joy.

我觉得自己高兴得心花怒放。

The flies are filled with freshwater, filtered from the brine.它们能将盐水过滤，使体内充满淡水

fill with使 ... 充满，用...装满

The ball is filled with gaseous mixture.

那个球充满了气体混合物。

They were filled with wonder at the sight.

他们见此情景惊叹不已。

More and more migrants join in.越来越多的候鸟加入了捕食行列

join in参加； 加入

They pestered her to join in the scheme.

他们不断要求她参与那计划。

I will join in the project, heart and hand.

我会满腔热情地参加这项工程。