Chamber-loading trace, rifling trace, chamberthroat trace and bullet pulling brace are the four major bullet traces which formed on the bullet after its movement circulation.
进膛痕迹、线膛痕迹、坡膛痕迹、拔弹痕迹是弹头经枪械运动循环后，在弹头上形成的四种主要的弹头痕迹。
2
The abbé rose from his chair, made two turns round the chamber, and pressed his trembling hand against his parched throat.
教士离开椅子，站起来在房间里转了两圈，用颤抖的手紧压着他那干焦的喉咙。
3
The scheme to control launch power is introduced for changeable depth launch of missile. It is to change the aeration area at the nozzle throat of high pressure chamber in launcher.