- fasteners-countersinks for countersunk head serews
- 沉: sink
- 头: 5点就得动身 have to start before ...
- 用: 40分钟跑完全程 run the course in 4 ...
- 孔: hole; opening; aperture
- 圆柱头用沉孔: fasteners-counterbores for hexagon socket head serewsand slotted cheese head screws
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