chāoshì cháng yǒu mǎnjiǎn huódòng bǐrú mǎn jiǔshíjiǔ jiǎn èrshí

超市常有满减活动，比如“满 99 减 20”。

Supermarkets often have discount promotions, like 'get 20 off on purchases of 99 or more'.