gōngzuò / rényuán / měitiān / qīngchén / dōu / yào / shuāxǐ / zhàntái / shàng / de / wūzì / bǎochí / huánjìng / zhěngjié工作人员每天清晨都要刷洗站台上的污渍,保持环境整洁。The staff scrub the stains off the platform every morning to keep the surroundings clean.