我去参观美国旧金山自然科学探索馆。一进馆,我就被丰富多彩的科技活动紧紧地吸引住了。龙卷风呼呼的吹,我用手一碰,他就改变了方向。这是怎么回事?我和小朋友们一起用积木搭了一座拱桥,拱桥立起来以后,竟不会倒塌,这又是 I went to visit the San Francisco Museum of Natural Science Discovery. As soon as I entered the museum, I was very much attracted by the rich and varied science and technology activities. Tornado whirring blow, I touched by hand, he changed direction. This is how the matter? I and children with building blocks to take an arch bridge, standing up after the arch, would not collapse, which in turn is