xuán bèi 犹转身。形容时间短促。《资治通鉴·宋文帝元嘉元年》:“ 羡之 大怒曰:‘与人共计议,如何旋背即卖恶於人邪!’” 胡三省 注:“旋背,犹今人言转背也。”
结论:前臂完全旋后时,桡骨向远侧、背侧移位,尺骨头靠在尺骨切迹的掌侧面。
Conclusion: While the forearm in complete supination, the radius shifts to the dorsal and distal side, and the capitulum ulnae is at the volar side of the notch ulnae.
旋叶式压缩机的背压对滑片的运动及压缩机的性能有很大的影响。
The vane slot backpressure has great influence on vane behavior and compressor performance.
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