solve,decipher,resolve,unravel
The central meaning shared by these verbs is “to clear up or explain something puzzling or unintelligible”:
这些动词所共有的中心意思是“澄清或解释某种令人疑惑或不可理解的事情”：
solve a riddle;
解答一个谜语；
can't decipher his handwriting;
读不懂他的字迹；
resolve a problem;
解决一个问题；
unravel a mystery.
解开一个谜