使用面积系数的英文：
usable area coefficient

usable or operative or practiced in all kinds of weather.
在任何天气下都可使用、都有效或都可运行。

The act of obtaining usable substances from unusable sources.
废物利用从无用的东西中获取有用物质的行为

To procure(usable substances)from refuse or waste products.
回收利用从废物或废品中获取(可用之物质)

This is a drainage area.
这里是排水区。

The areas of greater rainfall conform roughly with these forested areas.
降雨量较大地区大致与这些森林地区相符合。

The?penalty area?is the rectangular area in front of the goal.
禁区就是指球门前的矩形区域。