- sth
- 侧: slant; sloping
- 开: open; turn on; switch on; be ...
- 孔: hole; opening; aperture
- 从内侧开孔: open holes firom inside
- 开孔: cutout; open pore; open-cell; perforate; perforation; piercing; port; scallop; sluice opening; start a hole; starting a hole; tapping; trepan
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