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- 伪投射左S-系Pseudo-projective left S-acts
- 所有强平坦左S-系是正则系的幺半群Monoid over which all strongly flat left S acts are regular
- 左left
- 左对齐flush left
- 中文系department of Chinese language and literature
- 全系holophyly
- 证伪falsification
- 左的sinistral
- 报系syndicate
- 色系colour system
- 在左left
- 伪词源(学)false etymology
- 左舷port
- 大陆法系Continental Legal System
- 左下的bottom-left
- 白垩系cretaceous
- 左前left anterior
- 第四系quaternary system
- 左上方top-left
- 拓扑群的投射系Projective system of topological groups
