New Words：

dust [dʌst] n. 粉尘；尘埃；尘土
dusty ['dʌsti] adj. 布满灰尘的；灰尘覆盖的

Sample Sentences：

She blew the dust off the book.
The books were all covered with dust.

The books looked dusty and unused.
Clean the dusty windows before you go home.
It was one of the driest and dustiest places in Africa.

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