# usefulness ##### 词义 - 英:/ˈjuːsflnəs/; 美:/ˈjuːsflnəs/ - #词性/n 有用;实用;可用性 ##### 例句 - There are doubts about the usefulness of these tests . - 这些试验是否有用,人们有所保留。 - The attitude of the parents toward the usefulness of what is learned must colour the way children approach school . - 父母对学知识是否有用的态度必定会影响孩子对待学业的态度。 - The building has outlived its usefulness . - 这座楼房已超过使用年限了。