New Words：

trench [trentʃ] n.沟槽;沟;海沟;战壕;渠

Sample Sentences：

They dug trenches in the field.
We are digging trenches for a water system.
The soldiers fought in trenches for ten days.

system [ˈsɪstəm] n.系统
soldier [ˈsoʊldʒər] n.士兵;军人

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