floor closer meaning in English

地板闭锁器
地弹簧

Aluminum alloy doors with floor closer
铝合金地弹簧门
On the floor close to his hand there was a little round of paper , blackened on the one side
在靠近他手的地板上有一个小圆纸片，一面涂了黑色。
I remembered coming out ten years ago ， walking the last stretch across the lohu bridge with its rough wood floor closed in on both sides by guardhouses and fences
我记得十年前出来的时候，走罗湖桥上最后那段路，脚下踏着粗木板，两边的岗哨和铁网逼得很近。