useable

But they can produce useable optical and infrared data..但是它们可以提供可用的光学和红外数据。

For every container it displays ID, name, type, total pages, useable pages, and whether the container is currently accessible or not..而对于每个容器，它将显示其 ID、名称、类型、可用的页以及该容器当前是否可被访问。

Many guidelines exist to aid in the creation of useable graphical interfaces, but few exist to guide the co-development of accessible interfaces..有很多指导原则可以帮助创建可用的图形化界面，但是很少能够为同时开发可访问界面提供帮助。