名词
中文翻译：玉米石
同义词：
['corncrake', 'corncrake stone']
例句：
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1.The ancient city is built on a bed of cornstone.
这个古老的城市建在玉米石上。
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2. The farmer used the cornstone to make his tools.
农民用玉米石制作了他的工具。
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3. The cornstone was so hard that it could not be carved into any shape.
玉米石非常坚硬，无法雕刻成任何形状。