A cuboid glass fish tank, measured from the inside, has a length of 6dm and a width of 5dm. There is water in the tank, and the water surface is 1dm away from the upper edge of the tank. If a square iron block with a side length of 3dm is put into the fish tank, will the water overflow? Why?
一个长方体的玻璃鱼缸，从里面量，长6dm，宽5dm，鱼缸里装有水，水面离鱼缸的上沿还有1dm．如果往鱼缸里放入一块棱长为3dm的正方体铁块，水会溢出吗？为什么？
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