The mortar position should be protected from direct-fire weapons as best as possible.
迫击炮位应尽量避开敌军直接火力打击。
2
This was improved and some heavier direct-fire artillery was equipped with it as well.
而在这种系统得到改进之后，一些更重型的直瞄火炮也装备了这种设备。
3
The CID system consists of transponders that are mounted on vehicles and direct-fire weapon interrogators to help gunners determine if targets are friendly.