- (
physics 物理 the time taken for the radioactivity of a substance to fall to half its original value （放射性物质的）半衰期 - (
biology 生物 the time taken for the amount of a drug or other substance in the body to fall to half its original level （体内物质的）半衰期
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- joyless 3
- brogue 61
- her 77
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- destination 375
- Hem 24
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- drawn 38
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- clothing 374
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half-life
Radioactivity and radiation: alpha particle, atomic, becquerel...
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