The fourth step: keep the tracingprogram of each child.
第四步：持续每个幼儿不同的追踪课程。
2
Treat global concerns globally: Program elements should not have much say in the participation of concerns such as tracing and profiling in a crosscutting implementation.
要全局地对待全局关注点：程序元素不应当对关注点(比如在横切实现中进行跟踪和分析)的参与起什么作用。
3
Because this tracing work is interleaved with program execution, the GC can lose track of certain objects that the application can "hide" through executing loads and stores.