The word "usefulness" is a noun that means "being of use, advantage, or service" or "efficacy."
单词“usefulness”是一个名词，意思是“有用、有益、有效”或“效能”。
| 单词 | usefulness |
|---|---|
| 音标 | [ˈju:sfəlnəs] [ˈjusfəlnɪs] |
| 释义 | n.["有用，有益，有效","效能"] |
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