cooperation

n.合作

cooker, cookery, cookery book (also `cookbook), cookhouse, cookie (also cooky), cooking, cool, cool-headed, coolant, cooler, coolie, cooling, cooling tower, cooling-off, coolly, coolness, coon, coop, cooper, cooperate, cooperative, coordinate, coordination, coordinator, coorperation, coot, cop, cop-out, copain, copartner, copartnership, cope, cope with, copeck (also kopeck), Copernican, copier, coping, coping-stone, copious, copiously,