"孤注一掷"用英语怎么说？

all-or-nothing  adj.（只可能出现两种极端局面）全赢或全输的，孤注一掷的

used to describe two extreme situations which are the only possible ones 

Many crowdfunding programs↗/ are all-or-nothing. In other words, the innovator must garner 100 percent funding / for the project↗ / or the money is refunded / to the donors. ↘

许多众筹项目都是孤注一掷的。换句话说，创新者必须获得项目百分之百的资金，否则资金就要返回给捐助者。

nothing less than 完全是；不亚于；与…一模一样

Their willingness↗ to work together / is nothing less than a miracle. ↘

他们愿意合作简直是个奇迹。

for nothing  不花钱；免费；无酬劳；毫无结果；白白地（一般放句末）

without payment; with no reward or result 

•She's always trying to get something↗ for nothing. ↘ 

她总想不劳而获。

•All that preparation↗ / was for nothing / because the visit was cancelled. ↘

访问被取消，所有的准备工作都白费了。