（4）洞内爆破作业统一指挥信号的翻译：(4) hole blasting operation under unified command signals 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

(4) unity of command signals inside the cave blasting operations

(4) hole blasting operation under unified command signals

In (4) hole demolishes the work unified command signal

( 4) hole blasting operations within a unified command signal

(4) hole blasting operation under unified command signals