Four points stand out as being more important than the rest.
有四点比其余各点更为重要。
Don't let this go further than these four walls.
走出屋外这事就不要再谈了。
I found it a strain looking after four children.
我觉得照料四个孩子挺累的。
Students will normally take four or five AS subjects.
学生通常要选四门或五门高级证书辅助考试学科。
There are four GPs in our local practice.
在我们地区诊所有四个全科医生。