It took only 20 days to pass the tests and the vehicle even managed without the usual in such cases fine-tuning.

试飞只用了20天，且没有进行常规的细微调整。

youdao

It took only 20 days to pass the tests and the vehicle even managed without the usual in such cases fine-tuning.

试飞只用了20天，且没有进行常规的细微调整。

youdao