In fact, without optimism, issues as big and ongoing as poverty have no hope of solution.

事实上，如果没有乐观精神，像贫穷这样严重而且现正存在的问题是无望解决的。

youdao

Then again, without optimism, we might still be stuck in the Stone Age.

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Optimism without thoughtful and determined action can lead to disaster.

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However, his optimism is not without caution.

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