New Words：

trousers [ˈtraʊzərz] n. 裤子;长裤
helmet [ˈhelmɪt] n. 头盔;防护帽

Sample Sentences：

How much is that pair of trousers?
Mother bought me a pair of trousers.
He was dressed in a shirt, dark trousers and boots.

I really sleep good in this new bike helmet.
People hate to wear a helmet because it's thick and heavy.

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