;Sand is finer than gravel.
沙子比
细。
铺；使船搁浅在沙滩上；使困惑层；疏水，砂质砾过滤层路Sand is finer than gravel.
沙子比细。
He had been so absorbed with watching the building that he hadn't heard footsteps on the gravel path.
他留神观察
筑，竟没有听见砾路上的脚步声。
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