New Words：

plaster ['plɑ:stə] n. 石膏；灰泥；膏药
cast [kɑ:st] n. 铸件；铸造品；模子

Sample Sentences：

The plaster had started to come away from the wall.
The doctor had to hold his broken arm with a plaster cast.
The police made casts of the footprints in the soft earth outside the window.

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