在编写测试的同时您也就熟悉了未知代码的内部构造。

You explore the internals of the unknown code while writing the tests.

youdao

escape指的是对象引用没有保存到堆中，或者传递给可能保留一份拷贝的未知代码。

By escape, we mean that a reference to it is not stored into the heap or passed to unknown code that might retain a copy.

youdao

在调用未知代码(侦听器就是这样的代码)时，谨慎的方式是在try - catch块中执行它，这样，行为有误的侦听器不会造成更多不必要的破坏。

When invoking unknown code (which listeners certainly qualify as), it is prudent to execute it in a try-catch block so that ill-behaved listeners do not do more damage than necessary.

youdao