这本书有其他书所没有的优点。
盲人通常具有正常人所没有的优点：他们的听觉更敏锐。
Blind people usually possess one advantage over other people who can see their sense of hearing is far more acute.
超声珩磨具有珩磨力小、油石不易堵塞等普通珩磨所没有的优点。
Ultrasonic vibrancy honing has many advantages, such as small honing force, long oilstone life.
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