The performance of foam ceramics was improved by surface treatment of the flexible urethane cellular plastic.
本研究通过对软质聚氨酯泡沫塑料的表面进行处理，改善了泡沫陶瓷的性能。
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Bowling balls have advanced immensely over the past decade alone. Before the 1990's, the only types of bowling balls available were urethane, plastic, and rubber.