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costly a.昂贵的,浪费的
 
  
 cosmic being, cosmic dust, cosmic rays, cosmogony, cosmologist, cosmology, cosmonaut, cosmopolitan, cosmopolitanism, cosmos, cosset, cost, cost accountant, cost clerk, cost benefit, cost price, cost-effective, cost-effectiveness, costermonger, costing, costliness, costume, costume jewellery, costumier, cosy, cosy (US cozy), cot, cot-death, cotangent, cote, coterie, coterminous, cottage, cottage cheese, cottage hospital, cottage industry, cottage loaf, cottage pie, cottager, cotter-pin, cotton,  [[修改/添加解释]] | 
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