“机不可失，时不再来”，汉语成语，指“时机难得，必须抓紧，不可错过”，可以翻译为“Such an opportunity, once missed, will be forever gone”。还可以用“opportunity knocks but once”，意思是“great opportunities are typically only encountered once.”
- 机不可失，时不再来。哥们儿，如果你不去做，你会后悔的。
“Opportunity knocks but once, dude. You’ll always regret it if you don’t go for it.” - 机不可失，时不再来，这可能是你获得良好教育的唯一机会。
Opportunity knocks but once, and this may be your only chance to get a good education.
