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| PREFIX |
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| /sʌb/ |
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| 1 | one small part of a larger thingused with some nouns 表示“分，分支，子”（和某些名词连用） | a subset 子集 | |
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| 2 | smaller or less important than someone or somethingused with some nouns 表示“次于，亚于”（和某些名词连用） | a sub-post office 邮政分局 | |
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| 3 | below or under somethingused with some nouns and adjectives 表示“在…下面的”（和某些名词和形容词连用） | subaqua diving (=diving under water) 潜泳 | | substandard (=below average) 低于标准的 | | | 3a | further southused with some nouns and adjectives 表示“更靠南的”（和某些名词和形容词连用） | | sub-Saharan Africa 撒哈拉沙漠以南的非洲 | | the subarctic region 亚北极地区 | | |
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