To put a nock in a bow .
在弓上做凹口。
Screw heads have to be polished, with their slots and rims chamfered.
所有螺丝帽的边缘及凹口都要削角抛光,螺丝尾则须做平面或球面抛光。
fillip:弹指/刺激/用指弹
fillings /屑/ | fillip /弹指/刺激/用指弹/ | fillister /槽口刨/凹刨/用凹刨做的槽/