I thought I could trust him, but I couldn't. Oh well, you live and learn.我原以为能信任他，但还是做不到。唉，经一事，长一智。Do Americans really have a higher temperature than Europeans? Well, you live and learn.美国人体温真比欧洲人要高一些吗? 嘿，这真是活一天长一天见识了。I had no idea they were related. Oh well, you live and learn.我一点都没想到他们之间还有联系。唉，真是想不到啊。