There are doubts about the usefulnessof these tests.
这些试验是否有用,人们有所保留。
《牛津词典》
2
Man early learned the usefulnessof weapons.
人类很早以前就知道了武器的用处。
《新英汉大辞典》
3
An experimental version of the traditional scholarly methods course was designed to raise students' consciousness about the usefulnessof traditional learning for any modern critic or theorist.