No matter what the answer is, it's time to make a guess, as in Listing 10.
无论答案是什么，现在都该做出猜测了，见清单10。
2
The four lines of code at the bottom of Listing 1 prove that no matter how many times you ask for an instance of the ConnPool pool class, it will always return the same object.
清单1底部的四行代码则证明无论请求ConnPool池类的一个实例多少次，它都会返回相同的对象。
3
Adding it to your schema is a matter of importing the appropriate namespaces and documents (see Listing 3).