发帖
雷达卡
What method do you use to let a big needle float on the water but not sink into it?用什么方法将一根很大针投放到水面上，但不能沉下去？
Question:
There is a feasible method: first, the water should be frozen into ice, put the needle on the ice, then the ice melts, next the needle will be frozen with the ice.so we get it.有一个可行方法：先把水冻成冰，把针放在冰面上，再把冰慢慢融化，针结成冰浮在水面上。
Topic:
打破常规
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