For the most convincing look, assume the light source to be at the top left of the page - the shadow should simply be a thick grey line along the bottom and up the right edge of your shape.
为了更好看，在页面的左上方加上光源-阴影应该是沿着你形状的右边缘的上部和底部勾勒出粗的灰线条。
Selection of light source for on-line nep detection system.
棉结在线检测系统中的光源选择。
This text provides about the solution of a question of "line light source of the car light" in "2002 national university students mathematics modeling contest".
本文给出了“2002年全国大学生数学建模竞赛”中关于“车灯线光源”一题的解决方案。
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