adj.可选择的，随意的，任意的，非强制的，选修科目...

Several options are offered for the student's senior year.为毕业班学生开设了几门选修课。The biggest clearinghouse is the Options Clearing Corporation in the United States.最大的票据交换所是联邦期权票据交换公司.It means that all the options are at le...

option的现在完成时为：optioned...

n.采用，收养( adoption的名词复数 )...