6. dump vt. [dʌmp]倾卸，倾倒
例句：Some people just dump their rubbish in the river.
有些人径直往河里倒垃圾。
7. deaf a. [def]聋的;不愿听的
例句：He's 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。
例句：He is always deaf to his teacher's advice.
他总是对他老师的忠告充耳不闻。
8. decorate vt. ['dekəreɪt]装饰，装璜
例句：We decorated the house for Christmas.
我们装饰房屋过圣诞节。
例句：The house was empty and easy to decorate.
房子是空的，装修起来很容易。
9. principal a. ['prɪnsəp(ə)l] 最重要的 n. 负责人，校长
例句：My principal concern is my family's welfare.
我至为关心的是我一家的幸福。
例句：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。
10. principle n. ['prɪnsɪp(ə)l]原则，原理
例句：Archimedes, a greatphysicist, discovered the principleof floating bodies.
阿基米德，一位伟大的物理学家，发现了浮体原理。
例句：We adhere to the principle that everyone should be treatedfairly.
我们坚持人人都应该被平等对待这一原则。
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