Chinese

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half; semi-; incomplete
half; semi-; incomplete; (after a number) and a half
 
weak; feeble; decline
weak; feeble; decline; wane; mourning garments
 
a period of time; phase; stage
a period of time; phase; stage; (used for issue of a periodical, courses of study); time; term; period; to hope
 
simp. and trad.
(半衰期)
 
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Noun

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半衰期

  1. half-life