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half-life

noun

🔊/ˈhɑːf laɪf/

🔊/ˈhæf laɪf/

[countable]

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(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