New Words：

ensure [in'ʃur] v. 确保；保证；担保
mist [mist] n. 薄雾；水汽

Sample Sentences：

This medicine will ensure you a good night's sleep.
If you want to ensure that you catch the plane, take a taxi.

Everything was covered in mist.
She did not cry, but a mist came over her eyes.

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