书桌 desk 10$ 餐桌 dining table 10$ 椅子a * 6, chair a * 6 :: one is 5$ 蓝色椅子 b * 2, blue chair * 2 :: one is $5 椅子c, chair ::: 5$ 椅子d * 4, chair d * 4 ::: $10 双 ...