完全无用 meaning in English

to no avail
tonoavail

Nothing , totally useless
什么都没有，完全无用
Now , thanks to a robot , marin can open a door . his atrophied left arm isn ' t completely useless anymore
而今，由于机器人的帮助，马林的左手已能开门，这意味着，他肌肉萎缩的左臂不再完全无用了。
The offensive is the only means of destroying the enemy and is also the principal means of self - preservation , while pure defence and retreat can play only a temporary and partial role in self - preservation and are quite useless for destroying the enemy
进攻是消灭敌人的唯一手段，也是保存自己的主要手段，单纯的防御和退却，对于保存自己只有暂时的部分的作用，对于消灭敌人则完全无用。