通过训练自己保持乐观的态度,你会获得更多的勇气以面对困难。
By training yourself to look on the bright side, you will gain more courage to face difficulties.
我们有理由在这方面保持乐观的态度。
然而国家再生能源实验室的库尔茨却保持乐观的态度。
National Renewable Energy Laboratory's Kurtz remains optimistic, though.
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