系

菜系

cài xì

(regional) cuisine

太阳系

tài yáng xì

solar system

直系亲属

zhí xì qīn shǔ

next of kin

国际关系学院

guó jì guān xì xué yuàn

University of International Relations, Beijing, established in 1949

汉藏语系

hàn zàng yǔ xì

Sino-Tibetan language family

消化系统

xiāo huà xì tǒng

digestive system

坐标系

zuò biāo xì

coordinate system (geometry)

体系

tǐ xì

system

暧昧关系

ài mèi guān xì

shady relationship

关系网

guān xi wǎng

network of people with whom one has dealings on the basis of "scratch my back and I'll scratch yours"

关系

guān xi

relation

软件系统

ruǎn jiàn xì tǒng

software system