at one's sixties是什么含义?是不是在某人６０多岁 sixty为什么是sixties?另外：为什么也有用介词in的?

at one's sixties是什么含义?是不是在某人６０多岁 sixty为什么是sixties?另外：为什么也有用介词in的? 尽管已经六十多岁了,他仍然像年轻人一样努力工作.要用in one's sixties翻译成英语 at one's desire at one's expense at one's service at one's age at one's He left his hometown at the age of fifteen,and returned ___ his sixties.A.at B.on C.in D.byWhich one?Why? at one's best造句 snap at one's RT 请问 at one's back at one's worst是什么意思 是at one's school 还是 in one's school 在某人家应说in one's 还是at one's to work at one's utmost to work at one's utmostto work at one's utmostto work at one's utmostto work at one's utmostto work at one's utmost Threr's no one at home 用at one's own risk造句 point one's finger at someone