单词	half-life
释义	English American half-lifenoun [ C ] uk/ˈhɑːf.laɪf/us/ˈhæf.laɪf/specialized the length of time needed for the radioactivity of a radioactive substance to be reduced by half Thesaurus: synonyms and related words Physics: radiation & radioactivity alpha particle background radiation beta particle gamma radiation gamma ray irradiate irradiation radiation radioactive radioactivity radioisotope sievert tritium UVA UVB weak force half-lifenoun [ C usually sing ] us/ˈhæfˌlɑɪf/ physics, earth science the amount of time needed for the radioactivity (= harmful form of energy) of a radioactive substance to be reduced by half
随便看	accreditation accredited accredited accretion accretive accrual accrual accrual accounting accrual basis accrual basis accrual method accruals accounting accruals accounting accruals basis accrue accrued benefits accrued charge accrued charge accrued cost accrued cost accrued depreciation accrued depreciation accrued expense accrued income accrued interest