couldaux.可以;能;可能;can的过去式
couldn't help laughing.人为故障
Could he buy the car?人为污染
could order it for you.我们目前没有货,不过我们可以为您订购。
Could you come later?人造宇宙飞船
couldnot hold a candle tovt.比不上
Could you replace it?人造金刚石
Could I take it away?人工同位素
Could anyone tell me?人为污染物
Could not rename buddy.不能重命名好友。
Could you turn it up?adj.半合成的