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- 四four
- 四个一组之物四个（人或物）一组，如音乐四重奏，四缸发动机等something having four parts,units,or members,such as a musical quartet or a four-cylinder engine
- 四个tetrad
- 四年four years
- 四缸摆动活塞式压缩机传动机构设计Design of transmission for four cylinder compressor with pendular piston
- 四级four-stage
- 四国Shikoku
- 四大the four elements [earth, water, fire, wind]
- 四部four-part
- 四处all over the place
- 四倍fourfold
- 四舍五入round
- 双列四缸对置式蒸汽驱动往复压缩机duplex four-cornered steam-driven reciprocating compressor
- 四角foursquare
- 四叶草clover
- 大四学生senior
- 英语四级English Band 4
- 聚四氟乙烯polyfluortetraethylene
- 四次quartic
- 四缸发动机four cylinder engine
