1. 自行火炮
1. self-propelled gun：射钉枪:nail-shotting gun | 自行火炮:self-propelled gun | 平衡炮:gun for balance
2. self-propelled artillery：牵引式火炮:Towed artillery | 自行火炮:self-propelled artillery | 地面火炮:Ground artillery
3. 自行火炮
3. selfmechanizedgun：selfmass 自镜像核 | selfmechanizedgun 自行火炮 | selfmodulation 自调制
4. 自行火炮
4. self-propelled artillery piece：self-pollinating species;自花传粉植物;; | self-propelled artillery piece;自行火炮;; | self-purification;自净作用;;