首先用圆角长方形工具创建一个高70px圆角半径为10px的图形（注意要画路径图），现在我们不要底部圆角的部分而为它郑家一个更好的角效果。
Make it 70px high and a radius of 10px or more if you wish. Now we have to get rid of the bottom radius and make a perfect corner out of it.
根据这张图，我估计每个喷嘴的半径约0.6公尺(虽然我认为估计值稍微大了点)。
Based on this image, I am going to estimate each nozzle to have a radius of about 0.6 meters (although I think that estimate is a bit large).
首先，我们给出一些图的邻接谱半径的一些新的可达上界，并说明这些新结果在一定情形下比已有的结果要好。
Firstly, we present some sharp upper bounds on the adjacency spectral radius of graphs, and show that these bounds are somewhat better than the known ones.
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