This has the dual effect of overtaxing your working memory and not allowing you to go back over a line you didn't understand the first time.

这样做会产生双重效果，既会加重你的工作记忆负担，又不允许你反过来看第一次没有理解的那部分内容。

And if you know you're infected, and you get on a treatment program, and you are linked to care, you have a dual positive effect, good for the person and good to prevent infection.

如果你知道你被感染了，并且你开始了治疗计划，并且你得到了护理，那么你就会产生双重积极效果，既有益于人又有益于预防感染。