"I patted him on the head. in order to prevent her to me why yawning will shed tears, I hastened to ask him a question:" yawning can cry, you know what circumstances will shed tears?
我拍拍他的脑袋。为了防止她要为我为什么打哈欠会流泪，我赶紧先问他问题：“打哈欠是会流泪，你知道还有什么情况下会流泪吗？”
A series of train heads is obtained by changing the rate of length and width of a certain train head, in order to know if the rate will affect the drag coefficient.
对于同一种车型改变了它的细长度得到一系列车头模型，分析计算了细长度对车头阻力系数的影响。
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