zhè / dài / bèi / fěn / yǐ / jīng / kāi / fēng / hěn / jiǔ / le / zuì / hǎo / bú / yào / zài / yòng

这袋焙粉已经开封很久了，最好不要再用。

This bag of baking powder has been open for a long time, so it is best not to use it again.