Fifty-percent Expectation的希望

fifty-percent zone[军] 半数必中界

fifty y percent survival time百分之五十存活时间

fifty percent depreciation method五成折旧法

fifty percent disruptive dischargevoltage击穿电压的百分之五十

Fifty Percent Glossy五分光

fifty percent lethal dose半致死剂量

fifty percent method五五摊销法;半额法

Fifty Percent Off五折打