The definition of the coastal line (datums of island, uncoverd neaf and lighthouse) is more clarified on the basis of scientific location.

在科学选址的基础上，对海岸线（岛屿基准面，明礁和灯塔）的定义更加明确。

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The first line of each definition consists of three selectors that narrow the number of affected elements down.

每个定义的第一行包括三个选择器，这些选择器减少了受影响的元素的数量。

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And this we can compute using the definition of the line integral.

而且我们能用线积分的定义计算出来。

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