This is a hard process. I understand that.

这是个艰难的过程，我懂。

Its president and CEO, Peter Bunce, says restorating old airplanes is a slow and painstakingly hard process done mostly by enthusiasts.

其总裁兼首席执行官彼得·博尼斯表示大多由爱好者们修复的老式飞机过程十分缓慢且极其艰苦。

If you’ve ever known anybody going through chemotherapy, or have gone through it yourself, you know it’s a really hard process.

如果你曾经认识任何正在接受化疗的人，或者你自己也经历过化疗， 你就会知道这是一个非常艰难的过程。

You are just absorbed by the work, so it is a very hard process, and sometimes I don't have the time and the leisure to do that.

必须要全身心投入到创作中，这是个相当艰难的过程，有时我没时间也没心情去写小说。