### 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 the rule to be able to accurately predict, approximately a week of public transportation, need to be prepared in advance, sometimes the bad luck will turn ( suddenly several days in advance).
### Errors: There is a major error of incorrect translation has stylistic problems at "the rule". There is a major error of incorrect translation includes information not present in the correct translation at "public transportation". There is a major error of incorrect translation is missing content from the correct translation at "you can't". There is a major error of incorrect translation does not accurately represent the correct translation at "approximately a week". There is a major error of wrong grammatical register (eg, inappropriately informal pronouns). internal inconsistency (not related to terminology) at "suddenly".

### 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.