N a grey or whitish clay rock containing fossilized plant roots and occurring beneath coal seams. When used as a refractory, it is known as fireclay 底层粘土
Under normal conditions, rocks composed of clay produce far less friction than do other rock types.
在正常情况下，由粘土组成的岩石产生的摩擦要比其他类型的岩石小得多。
The clay was taken from the furnace and set down upon a board, in the cool air, under the blue sky.
黏土从灶中取出，放在一块木板上面，让它在蓝天之下凉风之中去慢慢冷却。
In his workshop, he used the clay to craft a pot. Then he dried it under the sun.
他来到陶器制作室，用粘土做了一个罐子，然后把它放在阳光下晒。
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