兽医使用螺栓枪迅速无痛地结束了这匹受伤马匹的痛苦。

The vet used a ___bolt-gun to quickly and painlessly end the suffering of the injured horse.

工人用螺栓枪快速固定了钢梁。

The worker used a ___bolt-gun to fasten the steel beams quickly.