下:sub-(常指往...下,居于从属地位的) de-(常指在...下)
★前缀表方向
subway 地下铁、地道----sub-下面,way-路
下面的路 地下铁
subsidy 补贴, 津贴
submit 屈从,甘受,忍受,听从,遵从
suburb 郊区,城郊
delay 延迟、耽搁----de-底下,lay-放
往底下放 延迟,耽误
deposit 沉淀,存款
不:ab-, un-,dis-,im-;
about 关注、关于、大约----ab不+out出去、离开
不出去,不离开 关注、关于、大约
unhappy 不高兴----un不、非+happy高兴 不高兴
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