At each step, we've found techniques better than the previous to let us decouple code from hard dependencies.
在每一步上,我们都会发现比以前更好的技术可以让我们把代码从硬依赖中解耦出来。
We shall find many of our lessons very hard, but let us consider that the harder they are the better they will do to us if we will persevere and learn them thoroughly.
我们会发现,许多功课非常难,但是我们得记住,那些功课越难,将来对我们的益处就越大--只要我们能持之以恒,完全弄懂。
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