xiǎohuá zǒujìn dàmén ， xiāndào yīlóu de hái shūjī qián ， bǎ shū fàngzài jīqì shàng 。

小华走进大门，先到一楼的还书机前，把书放在机器上。

Xiaohua walked in through the main door and first went to the return machine on the first floor, placing the book on it.