Think of a door that stands open for a short while. Walk through while it is open and the thing you wanted goes smoothly; come a minute early or a minute late and the same words, the same act, get you nowhere. Opportune is the label for that open door — and sometimes the door is a point in time, sometimes it is a place or a thing that happens to be exactly where you need it.
opportune 可以想成一扇只開一下下的門。門開著的時候走過去，事情就順；早一步或晚一步，同樣的話、同樣的動作就沒有效果。這個字標的就是那個「門開著」的位置。多數時候那扇門是一個時間點，偶爾也可以是一個剛好在那裡、剛好合用的地方或東西。
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