Health officials also said that immunity from only two doses decreases over time.

卫生官员还表示，只接种两针的免疫力会随着时间的推移而下降。

The doses I suggested for adults could be halved or quartered.

我建议的成人剂量可以减半或减至四分之一。

Workers at the nuclear plant were exposed to high doses of radiation.

核电站的工作人员受到大量辐射。

Health experts say ingesting a small amount of melamine poses no danger, but in larger doses, it can cause kidney stones and lead to kidney failure.

健康专家表示，摄入小量三聚氰胺不会有危险，但如果摄入量很大，可导致肾结石，并会诱发肾衰竭。

Vinyl Chloride, tetrachloroethylene, dichloroethene, and benzene are all chemicals that could cause health problems in high doses.

氯乙烯，四氯乙烯，二氯乙烯和苯都是高剂量可能引起健康问题的化学物质。