optimist n. 乐观主义者；乐天派

optimism n. 乐观；乐观主义

optimistic adj. 乐观的；乐观主义的

optimistically adv. 乐观地；乐天地

optimize vi. 优化；持乐观态度

optimise vi. 表示乐观

optimize vt. 使最优化，使完善

optimise vt. 使优化；充分利用

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optimist

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n. 乐观主义者；乐天派

美 ['ɑptɪmɪst]  英 [ˈɒptɪmɪst]

同 : happy go lucky / happy camper

example：

You need to be an optimist.

I am an optimist.

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optimism

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n. 乐观；乐观主义

美 ['ɑptɪmɪzəm]  英 ['ɒptɪmɪz(ə)m]

example：

They ended the discussion on a note of optimism.

What we want to show is our confidence and optimism.So whether we win or not is not that important.

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optimistic

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adj. 乐观的；乐观主义的

美 [,ɑptɪ'mɪstɪk] 英 [ɒptɪ'mɪstɪk]

同：rose-colored / rosy

example：

I think that we have reason to be optimistic.

We should all maintain an optimistic belief.

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optimistically

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adv. 乐观地；乐天地

同：rosily

example：

Go your way optimistically.

Optimistically,I can finish it next week.

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optimize

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vi. 优化；持乐观态度

vt. 使最优化，使完善

美 ['ɑptɪmaɪz]  英 ['ɒptɪmaɪz]

example：

That's why we optimize for happiness and you should too.

This is a great way to optimize load performance.

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optimise

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美 ['ɑptɪmaɪz]  英 ['ɒptɪmaɪz] 

vi. 表示乐观

vt. 使优化；充分利用

同vt.：make full use of / make good use of

example：

Yet as any programmer knows, it would be a mistake to optimise prematurely.