用a window of opportunity表达“机遇之窗”

a window of opportunity 就是机遇之窗的意思，指可以做某事的一个短暂时机或可能。

• I‘ve got a window of opportunity to talk to my boss about a pay rise tomorrow.
• Meet me in reception – there might be a window of opportunity for me to let you into the concert!
• Sometimes a problem can actually be a window of opportunity.

值得注意的是，go out (of) the window 的意思是什么事情已经过去了，来不及了、不可能了。

• My computer crashed yesterday, so any chance of finishing my work has gone out (of) the window.