A word, symbol, or number used as a descriptor for retrieval of information from a collection, especially in a coordinate indexing system.

用作描述符的一种字、符号或数，用于从某一集合中，特别是从某一配位标引系统中检索信息。

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The second thing I would add to that, and I didn't coordinate on the subject of this word but I think it's the right word that comes up, is passion.

第二件我想说的事就是，我并没有规划用这个字眼。 但我想这个字眼很合适，那就是“热情”二字。

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In a word, on the basis of theoretical research, this paper verifies the space-time coordinate transformation theory and field-mode time-grating theory through doing experiments in a large amount.

总之，本文在理论研究的基础上，通过大量实践性实验，验证了时空坐标转换理论和场式时栅理论。

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