- 四 [sì]
- （三加一后所得） four:
Volume Four; the Fourth Volume; 第四卷
a quarter; one-fourth; 四分之一
- （姓氏） a surname:
Si Hui 四晖
The ship sank in four fathoms.
I'll wait till four o'clock.
A square has four sides but a circle has no sides.
He felt very hungry after four-hours' hard work.
After walking for four hours we were beginning to flag.
This line is four times as long as that one.
This street is four times shorter than that one.