four

num.

四；四个；第四；

n.

四的；四个一组之物；

复数：fours

four seasons四季

four hundred名流；绅士

four modernizations四个现代化（农，工，国防，科技）；四化

gang of four四人帮

big four四大银行；大四星；四大会计师事务所

four balls四坏球

four dimensional adj. 四维的

on all fours完全一致；四脚着地地；匍匐

four tones四声

once every four years每四年一次

four wheel drive四轮驱动

1. Six minus two equals four.
   六减去二等于四。
2. This street is four times shorter than that one.
   这条街道比那条短四倍。
3. He arranged his speech under four main heads.
   他把发言内容归纳成四个主要方面。
4. The leap year comes around once in four years.
   每四年有一个闰年。

Four-Factor Index of Social Status
Attachment styles among young adults: a test of a four-category model.
A theoretical extension to the technology acceptance model: four longitudinal studies
A Theoretical Extension of the Technology Acceptance Model: Four Longitudinal Field Studies
A Theoretical Extension of the Technology Acceptance Model: Four Longitudinal Field Studies
Best practices in exploratory factor analysis: four recommendations for getting the most from your analysis
High-density lipoprotein cholesterol and cardiovascular disease. Four prospective American studies.
Understanding computers and cognition: A new foundation for design : Four reviews and a response
An international randomized trial comparing four thrombolytic strategies for acute myocardial infarction. The GUSTO investigators.
Developmental and regional expression in the rat brain and functional properties of four NMDA receptors.