usableness
/ˈjʊzəblnɪs/the quality or fact of being useful. "faults that affect the book's usefulness"
noun [具体名词] 可用；使用方便
The utility model has the advantages of simple structure, usableness and capability of continuously adjusting the height of the bunk bed. 本实用新型的优点：结构简单，使用方便，可以连续调节高低床的高度。
