usefulness 栏目: 英汉词典 查阅: 71次 n. 有用, 有益【经】 有用, 有用性在线英汉词典usefulness的短语、例句:usefulness n[U]: The old car has outlived its usefulness, ie is no longer useful or worth keeping. 这辆旧汽车已经不能用了. 标签:usefulness,用法,音标,短语