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4.A colt you may break,but an old horse you never can. 小驹犹可练,老马难驯。 →                                                   5.What youth is used to,age remembers. 少年惯为事,老年常记起。 →                                                   6.In the deepest water is the best fishing. 水深好钓鱼。 →                                                  

You may break a colt,but you can never break an old horse.

Age remembers what youth is used to.

The best fishing is in the deepest water.