New words：

surround [sə'raund]
v.环绕；包围；围绕；围住
n.周围；(物品的)边，饰边

Sample Sentences：

Tall trees surround the lake.
The lake is surrounded with/by trees.
Police, drop your weapons, you are surrounded.Freeze!
We'll surround the place. They will have to come out when they run out of food and water.

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