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Laser pen button: press this button to activate the laser pen.
激光笔按键：按下此键点亮激光笔。
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The stress state of laser hardened case was press stress.
激光淬火硬化层应力状态为压应力。
youdao
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The stress state of laser hardened case was press stress.
激光淬火硬化层应力状态为压应力。
youdao