By ceiling, we mean the highest amount or maximum value of, for example, memory you can use and still make practical use of the system.
所谓上限，我们指的是您可以使用并且目前为止实际用于系统的内存的最大值或最高使用量。
2
Wallpaper or wall covering: The most simple and practical way of wall or ceiling. Pasting material is white latex, polyethylene and water-soluble glue.
贴墙纸或墙布：一种最简单实用的墙面或吊顶方式。粘贴材料主要为白乳胶、聚乙烯等水溶性粘胶。
3
According to the practical situation of the field, this paper probes into the installation schemes of ceiling lighting lamps, and selects the best installation scheme.