flatten
单词辨析：
普通用词，指物体变平或使物体变平；也指通过撞击、轰炸等将建筑物、树木等夷平。
Why do biscuits flatten slightly while cooking?
为什么饼干在烤的时候会略微变平呢？
You'd better use the rolling pin to flatten the dough.
你最好用擀面杖把面团擀平。
The enemy bombers have flattened the city.
敌人的轰炸机把这座城市夷为平地。
只作及物动词，指将某物弄平整，或摧毁、夷平建筑物等，常可与 flatten 换用。
The workers managed to level/flatten the floor.
工人们设法把地面弄平整了。
Bombs levelled/flattened half of the city.
炸弹把一半城市夷为平地。
指用手把纸、布等弄平整。
He smoothed out the paper and then began to write on it.
他先把纸抹平，然后开始在上面写字。
She helped her son to smooth out all the wrinkles.
她帮儿子把所有的褶皱弄平整。
相关例句：
A longer pile carpet will flatten over time.
较长的绒毛地毯过一段时间会变得平伏。
The pressure of the atmosphere on the earth could flatten animal cells.
地球上的大气压可能会把动物细胞压瘪。
Flatten the dough with a press of the hand.
用手把生面团压平。
She used a rolling pin to flatten the pie dough.
她用擀面棍来擀平做馅饼的面团。
A large percentage of these forces had been flattened by the assault.
这些部队大部分都已经在这次进攻中被击溃。
In the squash court his chief aim is to flatten me
在壁球场上他的主要目标就是击败我。