qǐng / bú / yào / bǎ / yān / tóu / rēng / zài / dì / shàng / zhè / lǐ / gāng / gāng / dǎ / sǎo / guò

请不要把烟头扔在地上，这里刚刚打扫过。

Please do not throw cigarette butts on the ground; this area was just cleaned.