In reality, the image is a bit of an illusion: the lightning was far from the Observatory and the laser only appears to be cutting through the bolt.
在现实中，这个图像相当于一种错觉：闪电远离着天文台，激光似乎切断了这个闪电。
Tapping is the process of cutting a thread inside a hole so that a cap screw or bolt may be threaded into it.
攻丝是在一个孔中车出螺纹，以便装上有帽螺钉或螺栓。
The checking center device without the flange axis includes the measure arm, the cutting sleeve, the installment bolt and the dial indicator.
无法兰轴类校中装置，包括测量臂、卡套、安装螺钉及百分表。
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