【two】1.by twos and threes三三两两 2.between two fires左右为难 3.put two and two together推断(据实推论) 4.two heads are better than one 三个臭皮匠,顶个诸葛亮 5.there are no two ways about it 别无选择 6.of two minds 举棋不定 7.kill two birds with one stone 一箭双雕 ​