So we'll loop back to this in just a moment, but start by going back earlier in history.
我们稍后会回来继续讨论,先让我们回到早些时候
We'll be back just a moment for a final sum-up.
稍后回来的是我们最后的总结。
None of these do we have vaccines for, and it's turned out that sexually transmitted diseases for a variety of reasons, we'll come back to later, are particularly difficult to develop vaccines for.
这些病我们都没有疫苗,已经证明,对于性传播疾病,有很多原因使得,我们稍后回来再讲,针对这类疾病的疫苗特别难做出来
应用推荐