She was suddenly overcome by lethargy.是什么意思？

She was suddenly overcome by lethargy.

她突然委靡不振.

she

pron. 她，它；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

suddenly

adv. 意外地，忽然地，奄，勃，霍然；

例句
'It was incredible,' Kurt says, suddenly aglow.
“简直难以置信，”库尔特突然满面红光地说。

overcome

vt.& vi. 战胜，克服，压倒，制服，…不堪；vt. 被（烟、感情等）熏[压]倒，使受不了；vi. 受到…的极大影响；

例句
Love has the power to overcome the baser emotions.
爱能够战胜邪念。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

lethargy

n. 昏睡，没精打采，懒洋洋，嗜眠症；

例句
...the lethargy that plagued this project from its outset.
一开始就困扰着这个项目的人员懒散问题