By the next day, the pain was much worse and she was running a low-grade fever, but there was no other sign of infection. 到了第二天,疼痛越来越厉害并且她开始发低烧了,但是没有其它的传染病的症状。
He's suffering from some kind of low-grade infection, which he can't seem to get rid of. 他有一些轻微感染,似乎总是治不好。