语法宝典：含有数字four的英语成语

英语自学网

four square 直率的；坦白的
        The girl is four square. 这女孩很直率。
        on all fours 爬着
        The baby was crawling about on all fours. 婴儿那时正在满处爬。
        four-lettered words 下流话
        These books are full of four-lettered words. 这些书里脏话连篇。
        in fours 每组四个
        Group together in fours! 每四人一组!
        Students are standing in a line，in fours. 学生们每组四人排成队。