针对这类问题的一种面向对象式解决方案是使用工厂类。
The object-oriented solution to such a problem is the factory class.
先前针对这类细菌的研究几乎都把重点放在驯养的动物身上。
Until recently, most of the studies that have looked at bacteria in such species have concentrated on domestic animals.
针对这类问题的传统的面向对象的解决方案是利用子类型多态性—也就是说,继承。
The traditional object-oriented solution to problems of this sort is to leverage subtype polymorphism - that is, inheritance.
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
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