... obtuse-angle bevel gearing ==> 钝角锥齿轮传动 obtuse-angle blade ==> 钝角叶片 obvious proliferation ==> 增生明显活跃 ...
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obtuse angle blade 钝角叶片
obtuse-angle blade detail 钝角叶片
obtuse angle L-shaped blade 钝角L刀片
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