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Chinese dictionary
slafter a considerable period of time; as the years go by; as time goes by; for a long, long time; in the course of time
日久天长,把它变成一种习惯,对你没有好处。
It does you no good if you turn it into a habit in the course of time.
由于水的不断侵蚀,日久天长就形成了一个大溶洞。
As a result of continuous water erosion, in the course of time a huge cave was formed.