The key reason for the improved performance are the pairs of counterrotating swirls created at either side of the leading-edge bumps, called tubercles.
前缘能增进性能的关键理由，是因为在这些节瘤的两侧，会产生成对的反向旋
涡流。
的 向对的The key reason for the improved performance are the pairs of counterrotating swirls created at either side of the leading-edge bumps, called tubercles.
前缘能增进性能的关键理由，是因为在这些节瘤的两侧，会产生成对的反向旋涡流。
fddi不是单一环，而是两个反向旋的环，每台机器能够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.
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