看美剧学英语习语：Leave the door open

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leave the door open: To maintain or create the possibility of doing something or something happening in the future; to not prevent something from taking place at some point; to provide for the possibility that something might happen. To allow the possibility of accommodation or change; be open to reconsideration.
As in The patent on the product has expired, which leaves the door open for other companies to make it.

中文释义：leave the door open。大家知道， door就是门， open是开着。To leave the door open就是把门开着，但是作为一个习惯用语，它的意思就是不排除任何可能性。比如说，美国大学一般规定报考的学生必须在一月或二月之前交上申请材料。可是有些大学在期限过后仍然接受申请。也就是说： they leave the door open for more applications。
例句：We parted ways, but we left the door open for working together again sometime.（我们分道扬镳了，但我们还是敞开了大门，希望有一天能再次合作。）