The eyes are often retracted from dehydration.是什么意思？

The eyes are often retracted from dehydration.

眼睛常因脱水而凹陷.

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

eyes

n. 眼睛( eye的名词复数 )，视力，眼状物，风纪扣扣

例句
Her voice is passionate. Her eyes are ablaze.
她声音激昂，目光如火。

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

often

adv. 常常，经常，时常，再三；

例句
Genetic abnormalities are more often associated with faults in paternal DNA than in maternal DNA.
相对于母本DNA,基因畸变往往更多地与父本DNA上的缺陷相关。

retracted

v. 撤回或撤消( retract的过去式和过去分词 )，拒绝执行或遵守，缩回，拉回；

例句
During right LPN, the liver is retracted anteriorly and cephalad to expose the renal upper pole.
在右侧LPN中, 肝脏应在头侧的前位而暴露肾上极.

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

dehydration

n. 脱水，干燥，极度口渴，失水；

例句
The single butanol complexation dehydration technology cannot take all coordinated water molecules in bischofite away.
采用单纯的丁醇络合脱水方法难以完全脱除水氯镁石中的结晶水.