有一次，一只口渴的乌鸦碰巧遇到一只大水罐，里面只有一点点水。
A thirsty crow once came upon a pitcher with very little water in it.
这可能是一起事故、一次打斗、一场疾病或碰巧遇到饥饿的捕食者。
That something may be an accident, a fight, a disease or an encounter with a hungry predator.
昨天在购物中心，我碰巧遇见了那位我在一次聚会上认识的教授。
Yesterday, I happened to meet, in the shopping center, the professor whom I got to know at a party.
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