| 单词 | half-life |
| 释义 | half-lifeBrE /ˈhɑːf laɪf/ NAmE /ˈhæf laɪf/ noun [C ](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the time taken for the concentration of a substance in the body to fall to half its original value （体内物质的）半衰期 |
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