这里的床铺硬得跟石头一样。
Human teeth are almost as hard as rocks.
人的牙齿几乎和石头一样硬。
Vitreous rocks are hard and shiny.
靠近地表是冷却硬化的岩石。
Surface condition: The surface is relatively hard with sand and small rocks.
路面状况：路面地基较硬，多沙石。
We stuck hard and fast on the rocks in the middle of the river.
我们被阻滞在河当中的礁石上。
We stuck hard and fast on the rocks in the middle of the river.
我们被阻滞在河当中的礁石上。
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