引用计数很简单，但是需要编译器的重要配合，并且增加了赋值函数(mutator)的开销(这个术语是针对用户程序的，是从垃圾收集器的角度来看的)。

Reference counting is simple, but requires significant assistance from the compiler and imposes overhead on the mutator (the term for the user program, from the perspective of the garbage collector).

youdao

从开销来看，您应该看到一个明确的“腰”在后腿前缩小。

Viewed from overhead, you should see a definite "waist" narrowing in front of the back legs.

youdao

显然，这种方法从长期来看，在网络带宽和计算开销与加密相关事务验证方面都引入了可扩展性问题。

Clearly, this approach introduces a scalability issue in the longer term, in terms of both network bandwidth, and computational overhead associated with cryptographic transaction verification.

youdao