### 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 be able to predict accurately. The tolerance of about a week needs to be prepared in advance, and sometimes bad luck will <v>turn over</v> (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.
