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在返回的途中，反向路径变成正向消息路径。
On the return trip, the reverse path becomes the forward message path.
youdao
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本机拥有正向、反向无极调速旋转。
The machine has forward and reverse rotation speed Promise.
youdao
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本机拥有正向、反向无极调速旋转。
The machine has forward and reverse rotation speed Promise.
youdao