sub-

柯林斯词典

1. PREFIX Sub- is used at the beginning of words that have "under" as part of their meaning. 表示“下、在下”
The waters were rising about the rock and would soon submerge it. 水涨到快跟岩石一样高了，很快就会将它淹没。
...a nuclear-powered submarine. ...一艘核力发电的潜水艇。
2. PREFIX 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. 表示“附属、下属”
...a subcommittee on family values and individual rights. ...一个家庭价值观和个人权利的附属委员会。
...the subdivision of farms into smallholdings. ...将农场再细分成小农场。
3. PREFIX 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. 表示“低于、次于”
The cold has made already substandard living conditions even worse. 寒冷的天气使得原本就低于正常水平的生活条件更加低劣。