It is impossible to do otherwise.

聊复尔尔───It is impossible to do otherwise.

thanks for the compliment you are paying me, I am very sensible of the honour of your proposals, but it is impossible for me to do otherwise than decline them.───谢谢你的夸奖。你的求婚使我感到荣幸，可惜我除了谢绝之外，别无办法。