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PH.20

PH.20

PH.20

PH.20

1

The sperm protein used in the new birth control vaccine is called Ph-20. So far it has only been found in Guinea pigs .

在新节育疫苗中使用的精子蛋白叫 PH.20 。到目前为止仅见于豚鼠。

2

His work would be impressive if done by a Ph. D. economist with twenty years of experience in the profession.

这种工作如果由具有专业工作 20 年经验的一位经济学博士完成，就会给人留下深刻印象。

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He says , "In 20 years , you 'll need a Ph. D. to be a janitor. "

他说，“20 年里，为了门卫工作你可能要获得博士学位。”

5

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