儿童一般不允许入内,不过这次我可以破例。
Couldn't you make an exception?你就不能破例一次吗?
I know it's uncommon to offer a high school student this volunteer job, but I hope that you can make an exception for me, and I'll prove myself.我知道让一个高中生做这种志愿工作并不常见,但我希望您能为我破例一次,我会证明自己的。