### 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 is not regular enough to accurately predict. The tolerance of about one week needs to be prepared in advance, and sometimes it will <v>overturn</v> if it is unlucky (suddenly several days in advance).
### Errors: There is a minor accuracy/mistranslation error at "overturn" within <v></v>.

### 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.
