彻底搞清楚 meaning in English

satisfy oneself

I intend to set the matter at rest once and for all .
我打算把这件事彻底搞清楚。
When strong direction was given , and commands were shouted , the men responded , no matter how close the enemy
那些检查武器和个人弹药供给之类事物的下级军官也不可能彻底搞清楚这个问题。
" and certainly i ' d like to know once and for all , was an australian approved doctor allowed to visit mr adree when requested ?
“并且我想彻底搞清楚，在必要时允许一名澳大利亚核准医师探访阿得里先生吗？ ”