prostrate
词根词缀：
prostrate v. 使俯卧；使沮丧
pro 在前 + strat 扩散；层 + e → 前〔后〕在同一个层面上 → 使俯卧
stratify v. 使分层
strati 扩散；层 + fy 使… → 使分层
stratosphere n. 同温层
strato 扩散；层 + spher 球 + e → 地球表面的一层 → 同温层
stratum n. （pl. strata ）地层；社会阶层
strat 层 + um 场所 → 人们分出层次的场所 → 社会阶层
substratal adj. 基础的
sub 下 + strat 扩散；层 + al …的，具有…性质的 → 在下面一层 → 基础的
数据来源：新东方英语词汇速记大全
相关例句：
He stumbled and lay prostrate on the floor.
他被绊倒而俯伏在地。
Common prostrate Old World herb often used as a ground cover; formerly reputed to cure ruptures.
旧大陆一种匍匐的草本植物，经常用作地被植物；原来被认为可以治愈裂口。
We could see a man prostrate on the ground with two policemen standing over him holding guns.
我们可以看见一个男人俯卧在地上，而两个警察站在他身边，手里拿着枪。
Percy was lying prostrate, his arms outstretched and his eyes closed.
珀西闭着眼四仰八叉地平躺着。
I told him you was prostrate with grief.
我告诉他，你悲伤地起不来。
But having got it, I am prostrate with exhaustion; I seem to have been sucked dry of all my energy, and I feel nothing but desolation.
可是我得到了也累垮了，我像被抽空了一样精疲力尽，心境苍凉。