How the Other Half Lives 另一半人怎样生活 ; 另一半人如何生活 ; 穷人是如何生活的
The Other Half Lives 另一半的生活
half lives 半衰期
Two half lives 两个一半的人生
photolysis half-lives 光解半衰期
Howthe Other Half Lives 另一半人怎样生活
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N-COUNT The half-life of a radioactive substance is the amount of time that it takes to lose half its radioactivity. 半衰期
The long half-lives of PCDDs, PCDFs and “dioxin-like” PCBs mean that each daily ingestion has a small or even a negligible effect on overall intake.
PCDF和“类二恶英”PCB的半衰期很长，意味着每天的摄入对总摄入量的影响很小甚至可忽略不计。
She lives just half a mile away.
她就住在半英里之外。
More than half the world's population lives in cities, the most light-polluted of which prevent even the Big Dipper from being seen.
超过半数的地球人口生活在城市，那些光污染最为严重的城市甚至连北斗七星也看不到。
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