zhè / ge / yōu / huì / zhǐ / néng / zài / dān / yuè / xiāo / fèi / mǎn / wǔ / bǎi / yuán / shí / shǐ / yòng这个优惠只能在单月消费满五百元时使用。This discount can be used only when spending reaches 500 yuan in a single month.