each to each
·2,447,543篇论文数据，部分数据来源于NoteExpress
所以整套元素必须尽可能的精练，严格地将概念和符号一一对应起来，以使图示词汇表能够快速地被用户学会和使用。
The total set of elements should be kept as small as possible, maintaining a strict one-to-one correlation between concepts and symbols, so that the vocabulary can be learned and applied quickly.
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