ballista

n.

（古代用以发射石弹等的）抛石机，投石器；弩炮；

1. Some special units like ballista are dedicated to this task.
   某些特殊作战单位如弩车需要加入这次任务。

Ballista
Ballista
Ballista
Ballista Design and Methodology
The Ballista Software Robustness Testing Service
The 'ballista spring"system for impacted teeth
The Hatra ballista: a secret weapon of the past?
Modified Ballista Spring for Impacted Maxillary Canine
Treatment of Maxillary Impacted Canine using Ballista Spring and Orthodontic Wire Traction:
Lowering the Bar Behind Bars: Chao v. Ballista and Prison Official Liability in All-Female Prisons
Challenges Facing Options Crossing Networks: Insight from the ICE-Ballista Deal
Interface Robustness Testing: Experience and Lessons Learned from the Ballista Project
Interface Robustness Testing: Experience and Lessons Learned from the Ballista Project