1 PREFIX (用于词头)表示“在…之下”，“在…下面” Sub- is used at the beginning of words that have 'under' as part of their meaning. (用于词头)表示“在…之下”，“在…下面”
2 PREFIX (用于名词前构成新名词)表示“次”，“分支”，“部分” Sub- is added to the beginning of nouns in order to form other nouns that refer to things that are part of a larger thing. (用于名词前构成新名词)表示“次”，“分支”，“部分”
3 PREFIX (用于形容词前构成新形容词)表示“低于”，“亚于”，“次于” Sub- is added to the beginning of adjectives in order to form other adjectives that describe someone or something as inferior, for example inferior to normal people or to normal things. (用于形容词前构成新形容词)表示“低于”，“亚于”，“次于”