名词
中文翻译：谷物石
同义词：
['grainstone', 'grainstones']
例句：
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1.The ancient city is surrounded by a large grainstone wall.
这个古老的城市被一座大谷物石墙包围着。
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2. The grainstones were used to make the walls of the castle.
这些谷物石被用来建造城堡的墙壁。
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3.The grainstones have been used for centuries as building materials.
这些谷物石已经使用了数百年作为建筑材料。