Which route you take depends on whether you already have pieces of your application ready, or you are building it from scratch.
选择哪种途径取决于您是已经准备好应用程序的构件，还是完全从头开始。
Our discussion so far has assumed that we were building an application — and its model — from scratch.
到目前为止，我们的讨论都是假设从头开始构建应用程序及其模型。
And remember: the learning curve is steep, but adding new features to the CDT is far easier than building a custom debugging application from scratch.
记住：学习的过程虽然艰难，但为CDT添加新特性要比从头构建定制调试应用程序简单得多。
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