集 中 jí zhōng : to concentrate; to centralize; to focus; centralized; concentrated; to put together

密 集 mì jí : concentrated; compressed

濃 [浓] nóng : concentrated; dense

Big5: , Unicode: 6fc3 (濃),
Links: MT, Cantonese, Ld, Chinese Language

醲 nóng : concentrated; strong wine

Big5: , Unicode: 91b2 (醲),
Links: MT, Cantonese, Ld, Chinese Language

濃 縮 nóng sù : concentrate; concentration

下 工 夫 xià gōng fu : to put in time and energy; to concentrate one's efforts

注 «註» zhù : to inject; to pour into; to concentrate; to pay attention; to note; to comment on; to record; to register; to annotate

Big5: , Unicode: 6ce8 (注),
Links: MT, Cantonese, Ld, Chinese Language

耑 zhuān : concentrated; specialized

Big5: , Unicode: 8011 (耑),
Links: MT, Cantonese, Ld, Chinese Language

專 [专] zhuān : for a particular person, occasion, purpose; focused on one thing; special; expert; particular (to sth); concentrated; specialized

Big5: , Unicode: 5c08 (專),
Links: MT, Cantonese, Ld, Chinese Language

專 心 zhuān xīn : absorption; concentrate; concentrate; concentration; engrossed