New Words：

coast [kəʊst] n.海岸;海滨

shore 沿着海洋、湖泊或另一大片水域边缘的陆地，是一个比较笼统的说法。
coast 在海洋临近的陆地，特指海岸线（地理学）。
beach 海边或湖边的一片沙地或小石头(称为砾石);

Sample Sentences：

We walked along the coast for five miles.
I took a trip to the coast last weekend to relax.
What ocean is on the west coast of the United States?

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