例句與造句

1. Another option is a platform made to sit on top of a regular seated desk that raises the desk's surface to a useful height for standing.
2. The traditional spirit level produces these practically most useful heights above sea level directly; the more economical use of GPS instruments for height determination requires precise knowledge of the figure of the geoid, as GPS only gives heights above the GRS80 reference ellipsoid.
3. It's difficult to find useful height in a sentence. 用useful height造句挺難的