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。
Again, it is important not to exaggerate the risks, since common sense is also required in the paper world in identifying the party from whom a sheet of letterhead appears to originate.
再有一点是，不要夸大这种风险，因为在纸质环境下也需要使用常识来辨明谁看上去是开出带抬头信笺的当事人。
In this paper the operators do not possess any continuity and compactness, and that the operator is a self mapping on ordering interval is not required.
文中的算子不具有任何连续性和紧性，也不要求算子是某序区间上的自映象。
The format of this letter is applicable for most if not all submissions, although additional sections may be required for some types of paper;
投稿信的格式几乎适用于所有投稿；当然，某些类别的论文需要加入额外的内容。
The algorithm proposed in this paper is digital-audio-signal-independent, that is, the original audio signal is not required in the procedure of extracting watermark.
本文提出的水印嵌入算法是数字音频信号独立型的，在抽取水印时不需要原始的信号。
The algorithm proposed in this paper is digital-audio-signal-independent, that is, the original audio signal is not required in the procedure of extracting watermark.
本文提出的水印嵌入算法是数字音频信号独立型的，在抽取水印时不需要原始的信号。
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