您要查找的是不是：
- 系system
- L-S-系L-S-act
- 院系department
- 系上to buckle up
- 系带chalaza
- L-S度Leray-Schauder degree
- 中文系department of Chinese language and literature
- 菜系style of cooking
- L-S耦合L-S coupling
- 系的phyletic
- S-L问题S-L problem
- 科系department
- 系动词copula
- 左定S-L问题left definite Sturm-Liouville problem
- 全系holophyly
- 外语系department of foreign languages
- S（L）划分问题S(L) partition problem
- 家系stemma
- 报系syndicate
- 威廉斯。W-I-L-L-I-a-M-S。Williams. W-I-L-L-I-a-M-S.
