New Words：

rub [rʌb] v. 擦, 摩擦, 搓
microscope ['maikrəskəup] n. 显微镜

Sample Sentences：

I rubbed the window with a cloth.
He rubbed his hands to keep them warm.
Put the paper against the tree, then rub the crayon over it.
The microscope magnified the object 100 times.
They are looking at the blood samples under the microscope.

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