planar enveloping hourglass worm gearing是什么意思，planar enveloping hourglass worm gearing的翻译，planar enveloping hourglass worm gearing音标、读音、用法和例句

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planar enveloping hourglass worm gearing是什么意思，planar enveloping hourglass worm gearing的翻译，planar enveloping hourglass worm gearing音标、读音、用法和例句_衣物護欧路词典