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surface course /ˈsɜːfɪs ˈkɔːs/ n

中文：面层

中文 · 面层Español · capa de rodaduraFrançais · couche de surface
Meaning：Roadway’s driving surface; it is smooth, impermeable and provides a good grip for vehicles.
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Found in these illustrated scenes（1）

Road cross-section

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