He was able to prove an alibi which could not be shaken.

他证明了一个无法推翻的事实。

On the morning of the crime he can surely prove an alibi.

在犯罪发生的那天早上， 他肯定可以证明不在犯罪现场。

" I put it to you that, anxious to prove an alibi, you conceived the idea of a fictitious and rather incredible appointment, and wrote this note yourself in order to bear out your statement" !

“我告诉你，急于证明不在场证明，你构思了一个虚构的、相当不可思议的任命的想法，并自己写了这张纸条，以证实你的陈述”！