window of opportunity
window. 1) window of opportunity 机会。We have to make a decision now. We only have a small window of opportunity. 我们必须马上决定，机会转瞬即逝。2) window shopping 兜里没钱瞎逛。3) out (of) the window 浪费了，失去了。All that work is out (of) the window now. 所有努力都白费了。
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