### Chinese: 但也不是规律到能精准预测，大概一周左右的公差，需要提前准备，有时候运气差也会翻车（突然提前好几天）。
### English: But it is not regular enough to accurately predict. The tolerance of about a week needs to be prepared in advance, and sometimes the car will overturn due to bad luck (suddenly several days in advance).
### Errors: There is a major error at "The". There is a major error at "tolerance of". There is a major error at "week needs to be prepared in". There is a major error at "the car will overturn due". There is a major error at "bad luck (suddenly several days in advance".

### Improved English: But it is not so regular that you can precisely predict it; there is a difference of around a week; you need to prepare early and sometimes you may get unlucky and it arrives several days earlier.