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There were many kinds of bikes in the supermarket.

有许多种类的自行车在超市里。

A 3-D solid unit cell geometry model is developed, the characteristics of geometry are studied and yarn-jamming condition is discussed.

该几何模型考虑了纤维束在内部、边界及边角的不同交织方式，纤维束在整个编织过程中的连续性，保证了三维编织复合材料的结构完整性。