波士顿不断扩张的海港中，水是一种威胁

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district – n. an area established by a government or community

peninsula – n. a piece of land that is almost entirely surrounded by water and is attached to a larger land area

splash – v. to make something wet, usually in a noisy way

boardwalk – n. a walkway along the sea or coastline

pattern – n. something designed or used as a model for making things

tide – n. the rising and falling of the surface of the ocean