This problem has been solved through two-step.
本文分两步解决这个问题。
Fortunately, this problem has been solved before.
幸运的是，这个问题早已经解决了。
Through a great deal of effort, this problem has been solved recently by linearization techniques.
通过大量的努力，最近人们利用线性化方法解决了这个问题。
Through a great deal of effort, this problem has been solved recently by linearization techniques.
通过大量的努力，最近人们利用线性化方法解决了这个问题。
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