### 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 predict accurately. The tolerance of about a week needs to be prepared in advance. Sometimes, with bad luck, the car will overturn (suddenly several days in advance).
### Errors: There is a major error of incorrect translation has stylistic problems at "with bad luck, the car will overturn (suddenly several days in advance)". There is a major error of incorrect translation includes information not present in the correct translation at "suddenly several days in advance". There is a minor error of incorrect translation is missing content from the correct translation at "the tolerance of about a week".

### 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.