It was a long process of trial and error with the collaboration of factories.

这是一个不断试验的过程，当然也不可避免不断犯错误，这需要工厂和我们的通力合作。

youdao

It was a long process of trial and error with the collaboration of factories.

这是一个不断试验的过程，当然也不可避免不断犯错误，这需要工厂和我们的通力合作。

youdao