New Words：

cot [kɒt] n. 童床
mattress [ˈmætrəs] n. 床垫；垫子

Sample Sentences：

Please put the baby into the cot.
Don't go away. What if the baby fall out of her cot.

She hid the money under the mattress.
We slept on a mattress in my uncle's kitchen.

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