I must complete writing the letter within an hour.

我一定要在一小时内写完信。

youdao

Putting off mowing the lawn, or not writing a letter, may not seem like a big deal, but every time you don't carry out tasks you think you should complete, you ignite a mild fight or flight response.

该修剪的草坪一直没剪，或者是一封信总是没有写，看起来都不是什么大事，但是每一次你没有做完你应当完成的工作，你就燃起了一场微弱的斗争或是内心的逃避。

youdao