5. dumb a. 哑的;沉默的
Shes been dumb from birth.
她生来就是哑巴。
We were struck dumb with horror and grief.
惊恐和忧伤使我们哑口无言。
6. dump vt. 倾卸,倾倒
Some people just dump their rubbish in the river.
有些人径直往河里倒垃圾。
7. deaf a. 聋的;不愿听的
Hes a deaf mute and cannot tell anyone secret.
他是个聋哑人,不会把他们的秘密告诉任何人。
He is always deaf to his teachers advice.
他总是对他老师的忠告充耳不闻。
8. decorate vt. 装饰,装璜
We decorated the house for Christmas.
我们装饰房屋过圣诞节。
The house was empty and easy to decorate.
房子是空的,装修起来很容易。
9. principal a. 最重要的 n. 负责人,校长
My principal concern is my familys welfare.
我至为关心的是我一家的幸福。
When I came into the office, the principal rose to welcome me.
当我走进办公室时,校长起身欢迎我。
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