易混淆的单词： SterileSTERILE

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Scientists used to think breast milk was sterile , like urine .

科学家们过去常常认为母乳是无菌的，就像尿液一样。

Her husband had contracted venereal disease before their marriage , ms. pakula writes , and was probably sterile .

pakula女士称，她的丈夫在他们婚前就感染了性病，可能导致不育。

History is a sterile earth where heather does not grow .

历史是一块贫瘠的土地，生长不出欧石南。

The uterus is a sterile environment .

子宫是个无菌的环境。

The plant has to buy a huge number of eggs and make sure they 're all sterile .

工厂不得不购买大量的鸡蛋，并且要保证这些鸡蛋是无菌的。