【英语时差8,16】什么是疱疹？B

 In fact, recurrence¹ of these painful cold sores is very common because once you have the virus, you never get rid of it. The latent virus can be triggered by many factors. Exposure to wind and sun can cause an outbreak, and so can physical or emotional stress. Many people who have the virus get a blister² every time they come down with a cold because their immune systems get overloaded³ and can’t attend to everything at once. Some people never get cold sores because they have never been infected with the virus, which you can get through direct contact with the lips or mouth of a person with an active sore. Researchers believe that most people were infected as children when an adult with a cold sore kissed them.

1 recurrence   

n.复发，反复，重现

参考例句：

• More care in the future will prevent recurrence of the mistake.将来的小心可防止错误的重现。
• He was aware of the possibility of a recurrence of his illness.他知道他的病有可能复发。

2 blister   

n.水疱；(油漆等的)气泡；v.(使)起泡

参考例句：

• I got a huge blister on my foot and I couldn't run any farther.我脚上长了一个大水泡，没办法继续跑。
• I have a blister on my heel because my shoe is too tight.鞋子太紧了，我脚后跟起了个泡。

3 overloaded   

a.超载的，超负荷的

参考例句：

• He's overloaded with responsibilities. 他担负的责任过多。
• She has overloaded her schedule with work, study, and family responsibilities. 她的日程表上排满了工作、学习、家务等，使自己负担过重。