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无声齿轮
oil silent type gear
tech. quiet gear; silent gear
无声齿轮传动
auto. quiet gear
无声齿轮啮合转动时噪声很小的齿轮
auto. silent gear
无声〔塑料〕齿轮
tech. silent gear
无声齿轮
: 3 phrases in 1 subject
Technology3