Today, I'm a very confident and optimistic person.

如今，我是一个非常自信和乐观的人。

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Americans are by nature a confident and optimistic people.

美国人天生就自信、乐观。

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I'm optimistic and confident the world is equipped to deal with the challenges we face — and a big part of the reason is seeing young people like you.

我认为这个世界有能力解决我们所面临的这些挑战。我对此感到乐观和充满信心的一个重要原因，就是看到有你们这样的年轻人。

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"I think my best years are still ahead of me, and I'm very confident and optimistic about the future, " he said.

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"Inspired by the people with cancer whom we serve, we feel confident and optimistic about the Foundation's future and welcome an end to speculation, " the group said.

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Today, there seems to be ample reason for pessimism and little about which to be confident and optimistic in social welfare, economic and financial, fiscal and financial sector trends in Japan.

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