我们致力于这方面已经有12年了，从中学到了很多东西。

We've been working on it for 12 years. We've learned a lot from it.

youdao

我们致力于这方面已经有12年了，从中学到了很多东西。

We've been working on it for 12 years. We've learned a lot from it.

youdao