sub-
/sʌb/prefix
1
- at, to, or from a lower level or position表示“下面”, “底下”, “往下”：
subalpine.
1.1
- lower in rank表示“下级”, “次要”, “从属”：
subaltern
subdeacon.
1.2
- of a smaller size; of a subordinate nature表示“次”, “亚”：
subculture.
2
- somewhat; nearly; more or less表示“几乎”, “近于”, “接近”：
subantarctic.
3
- denoting subsequent or secondary action of the same kind表示“分”, “分支”, “再”：
sublet
subdivision.
4
- denoting support表示“资助”, “支援”：
subvention.
5
- Chemistry in names of compounds containing a relatively small proportion of a component【化】表示“下”, “低”, “亚”, “次”, “逊”, “分支”：
suboxide.
USAGE
Sub- is also found assimilated in the following forms: suc- before c; suf- before f; sug- before g; sup- before p; sur- before r; sus- before c, p, t.
词源
from Latin sub 'under, close to'.