optimism /ˈɒptɪˌmɪzəm/ n. 乐观；乐观主义

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例句/词组:

We may now look forward with optimism.

我们现在可以乐观地展望未来。

英语解释：

a feeling that good things will happen and something will be successful; the tendency to have this feeling 乐观；乐观主义