now or never

基本解释

also warned the time was “now or never” for breaking the Doha Round impasse and reaching a global trade deal.
佐利克还警告说，对于打破多哈回合僵局，达成全球贸易协定，“机不可失，失不再来”。
Going to Miami was not the problem, but a TV show to announce his decision, Tweeting "now or never" ... he's due for some soul searching.
去迈阿密没有问题，但不能只是在电视上宣布自己的决定，说什么“机不可失失不再来”，他需要找到灵魂追求的东西！
Meanwhile, Energy Secretary Steven Chu, traveling in Vienna, said Copenhagen is not a "now or never" chance to scale back global greenhouse gas emissions.
与此同时，正在维也纳美国能源部部长朱棣文也表示哥本哈根会议并不是“机不可失，时不再来”，以后人们还可以有机会对温室气体的排放进行规定。

Meanwhile, his youth was going away and now this imaginary student is now thirty-three years old never had time to marry or start a normal life.
与此同时，他的青春年华也已经逝去了,现在这位设想出来的同学已经33岁了,还没有结婚也没有开始正常人的生活。
耶鲁公开课 - 金融市场课程节选

According to Ian Vasquez, an analyst at the Cato Institute in Washington, it's now or never for the administration on trade.
FORBES: Bush's Risky Trade Bet
The implication builds in scene after scene that it was truly now or never for abolition by the end of January 1865.
FORBES: In Lincoln (2012 Movie), Why Did Lincoln Rush The Vote On The 13th Amendment?
CN, despite their bluster that it has to be now or never.
ECONOMIST: What kind of industry asks its regulator to block all deals?