1.The key reason for the improved performance are the pairs of counterrotating swirls created at either side of the leading-edge bumps, called tubercles.
隆起前缘增进性的关键理,为在这些隆起节瘤的两侧,会产生成对的反向旋涡流。
2.fddi不单一环,而两个反向旋的环,每台机向左右邻发送和接收数据。
Rather than being a single ring, FDDI is two counterrotating rings.Each machine can both send to and receive from each of its two neighbors.