The middle hole is used for cable going through.
中间窗孔供三相电缆穿过。
Should be installed in the Start strip of each screw hole in the middle.
在起始条的每个需安装螺钉的孔中间，用记号笔作记号，并取下起始条。
Bite it in the middle, it's a pancake hole!
在中间咬一口，咬出了个煎饼洞！ ！
The processing method for inside whorl of middle and small hole is introduced.
介绍了中小孔径内螺纹的加工方法。
The processing method for inside whorl of middle and small hole is introduced.
介绍了中小孔径内螺纹的加工方法。
应用推荐