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1·Then he wags his tail in approval.

它会摇摇尾巴示意它同意。

2·A dog wags its tail when it is happy.

狗高兴了就摇尾巴。

3·The dog wags its tail.

这狗摇着尾巴。

4·If my tail wags, it is a reflex action.

假如我的尾巴摇动，那只是反射动作。

5·Learn why the world wags and what wags it.

学习为什么这个世界总是在变，什么使它变化。

6·The world wags on.

而这世界摇摆不定。

7·Points or wags his or her finger aggressively.

带有攻击性的挥动手指或指着你。

8·I talk to her. She wags her tail, and smiles at me.

我对她说话，她摇一摇尾巴，对我微笑。

9·The dog wags his tail as if to tell her how glad he be.

那狗儿摇动尾巴，像是要告诉她：它是何等高兴。

10·He hops with joy; he wags his head; his shirt comes untucked.

他愉快地跳舞；他摇着脑袋；他敞开衣衫。

(1)wag its tail（狗）摇尾巴