6) animal expression + animal expression
cock sparrow 公麻雀
hen sparrow 母麻雀
bull elephant 公象
cow whale 母鲸
7) animal expression–and-animal expression
cat-and-mouse 折磨人的
horse-and-buggy 过时的
cat-and-dog 不和谐的
8) as + adj.+ as + animal expression
as brave as a lion 勇猛如虎
as timid as a hare 胆小如鼠
as hungry as a hawk 如同饿狼
as mute as a fish 噤若寒蝉
