plain porcelain ball 动力学研究
The lecturer just smiled and went to the kitchen to get an assortment of cups-some porcelain, some in plastic, some in glass, some plain looking and some looked rather expensive and exquisite.
老师只是笑笑，然后到厨房取来各式各样的杯子——瓷杯、塑料杯、玻璃杯等等，有些外表平平，有些看起来精致名贵。
The lecturer just smiled and went to the kitchen to get an assortment of cupssome porcelain, some in plastic, some in glass, some plain looking and some looked rather expensive and exquisite.
老师只是笑笑，然后到厨房取来各式各样的杯子瓷杯、塑料杯、玻璃杯等等，有些外表平平，有些看起来精致名贵。
They can be made of porcelain, earthenware, or stoneware and are usually plain colored.
他们可以做的瓷器，陶器，石器和或通常平原色。
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