concentrate on
词形变化：
形容词: concentrative | 副词: concentratively | 名词: concentrator | 动词过去式: concentrated | 动词过去分词: concentrated | 动词现在分词: concentrating | 动词第三人称单数: concentrates |
同义词：
focus | strengthen | think | thicken | intensify | condense | centre | centralize | distillate | essence | quintessence | converge | come together | consolidate | aggrandize | distill | about | think about | extract | compress | make | stronger | reduce | boil down | center | pore | rivet | contract | decoct | digest | centralise |
反义词：