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问题: 翻译

The direction of the structural "grain"of the coastal rock affects the shape of the coastline. If the grain is mostly parallel to the coast, as along the Oregon coast, the mouths of few rivers_will indent the coastline because river valleys_tend to follow the grain.
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解答:

海边岩石的纹路结构的方向影响着海岸线的形状。如果纹路大多与海岸线平行,就像俄勒冈海岸,那么一些河流的入海口就会切割开海岸线,使其呈锯齿状,因为河流的流向趋势与纹路是一样的。