### 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: However, it isn't regular enough to accurately predict. There is a tolerance of about a week or so and preparations need to be made in advance. Sometimes, it will overturn with bad luck (suddenly several days ahead).
### Errors: There is no error in the English translation.

### 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.
