如果计划均告失败
if none of our plans succeed
If all else fails, we can always stay in and watch TV. 如果其他的都行不通，我们总是可以呆在家里看电视。
If all else fails, you will have to take legal action.
He has a backup battery and a generator for his respirator, but always stays within reach of friends who can get him to a hospital if all else fails.
We're doing everything we can to protect our home from the storm, but if all else fails, we can go to a nearby hotel.
If all else fails, we can't rule out military action.
See also: fail verb (NOT SUCCEED)