壽命的英語翻譯：

life; life-span; longevity
【計】 live time
【醫(yī)】 duration of life; life; span life; tau.

保證的英語翻譯：

guarantee; assure; certify; warrant; ensure; pledge; secure; assurance
guaranty; surety; warranty
【經(jīng)】 assurance; endorsement; guarantee; guaranty; recognizance; scure
secure; security; surely

周期的英語翻譯：

cycle; period; wheel
【計】 C; cycle time; loop cycle; periods
【化】 period
【醫(yī)】 cycle
【經(jīng)】 cycle; period