求翻译啦 Opportunity knocks but once．啥意思呢

求翻译：Opportunity knocks but once．啥意思呢 求翻译啦 Opportunity knocks but once．啥意思呢 Opportunity knocks but once 翻译 谁帮我翻译一下…opportunity knocks but once. an opportunity knocks only once. Opportunity seldom knocks twice. opportunity knocks once,and the neighbors the rest of the ti Opportunity seldom knocks twice.怎么读 什么意思?求翻译,谢啦 hate you but you are 啥意思,求翻译 求翻译：No matter how familiar with once,but can only so strange Death knocks at the door什么意思