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The serum is vitiated byexposure to the air.是什么意思？

The serum is vitiated byexposure to the air.

血清暴露在空气中已变质.

相关词汇
the serum is vitiated to air

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；

serum

n. <医>血清，血浆，浆液，树液，乳清；

is

vt.& vi. 是（be的三单形式；n. 存在；

vitiated

v. （使）削弱( vitiate的过去式和过去分词 )，（使）破坏，（使）损害，（使）无效；

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

air

n. 天空，空气，空中，神态，曲调；v. 晾干，通风，公开发表，播送；
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