Providing a diagram is very helpful but not required. You can draw a diagram on the computer or you can draw it on paper and then scan it or photograph it with a digital camera.
最好能提供一张图，但图不是必须的。你可以用电脑画一张表或你在纸上画然后扫描它或者用数码相机拍下来。
Artist is not only required to have a vision of the object he needs to create, he also needs to be an expert in cutting and folding paper and last but not least have a great deal of patience.
创作这些作品的艺术家们，不仅要有非凡的想象力，动手能力也要求极高，耐心更是不可或缺。
Extra reading is permitted but not required for this paper.
这篇论文容许其他阅读资料，但并不是必需。
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