The word 'optimism' is a noun that refers to a hopeful or confident attitude.
单词 'optimism' 是一个名词，指乐观或乐观主义。
| 单词 | optimism |
|---|---|
| 音标 | [ˈɒptɪmɪzəm] [ˈɑ:ptɪmɪzəm] |
| 释义 | n.["乐观","乐观主义"] |
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