缩杆 meaning in Chinese

sub-side

Backspin - the effect of striking the cue ball below centre
缩杆击打主球球心以下的位置后所产生的结果
The types are : head - forging mould , in - out rod mould and threetimes head - forging mould , etc
有顶锻模缩杆模三序顶锻模等多种
Specification : flat head cold - flow model , countersunk head cold - flow model , primary drawing mould , pole - shorten model , etc
规格：平头冷墩模、沉头冷墩模、一序冲顶模、缩杆模等。