求翻译：Opportunity knocks but once．啥意思呢

do I have this opportunity 求翻译. 求翻译：Opportunity knocks but once．啥意思呢 Opportunity knocks but once 翻译 opportunity Moving to another country can be the opportunity of a lifetime.求翻译 求翻译啦 Opportunity knocks but once．啥意思呢 Luck is only opportunity meeting readiness(翻译) Don't give up this opportunity,not to face the difficulties and timid,I need you 求翻译 Trouble is only opportunity in work clothes.的翻译 have an opportunity to do sth造句要有翻译, 谁帮我翻译一下…opportunity knocks but once. In the middle of every difficulty lies opportunity翻译汉语 Lonely too can seize every opportunity 翻译下 not to waste an opportunity for sleep的翻译 高手们!求翻译啊!英语爱好者请进!If woman conceal her affection with the some skill from the lose the opportunity of fixing him! 万分感谢! 求翻译啊急用!there is plenty of opportunity for individuals to rise above or fall below the level to which their endowments and environment might direct them. opportunity是什么意思, opportunity是什么意思