| 正面 | 2374.concentrate 英 ['kɒns(ə)ntreɪt]美 ['kɑnsn'tret]     |
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| 背面 |      释义： 在数学的排列与组合中用 A 代表 Arrangement 表示“排列”（在旧教材为 P -> Permutation），用 C 代表 Combination 表示“组合”，所以如果你还记得排列与组合的计算公式的话，就一目了然了。vi. 集中；浓缩；全神贯注；聚集vt. 集中；浓缩n. 浓缩，精选；浓缩液 例句： 1. They will concentrate on teaching the basics of reading, writing and arithmetic.他们将集中教授阅读、写作和算术基础知识。 concentrate 集中con-, 强调。-center, 中心。 concentrate (v.)1630s, "to bring or come to a common center," from concenter (1590s), from Italian concentrare, from Latin com- "together" (see com-) + centrum "center" (see center (n.)). Meaning "condense" is from 1680s. Sense of "mentally focus" is c. 1860. Related: Concentrated; concentrating.concentrate (n.)1883, from concentrate (v.)." |