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用很多铁圈将一个小南瓜整个箍住,观察当南瓜逐渐长大时,对这个铁圈产生的压力有多大。试验的第一个月,南瓜承受了500磅压力;试验进行到第二个月,南瓜承受了1500磅压力;当它承受到2000
Use a lot of hoops to pump a small pumpkin across the hoop to see how much pressure the pumpkin will have on the hoops as the pumpkin grows. Pumpkin suffered 500 pounds of stress the first month of the test; until the second month of testing, the pumpkin was subjected to 1,500 pounds of pressure; when it sustained 2000