We do not be disheartened , cannot be unrealistically optimistic either.

我们既不要悲观失望, 也不能盲目乐观.

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If this is not affirmed, people will be disheartened.

不肯定这一点, 就泄气.

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Don't be disheartened by single failure.

别因一次失败就气馁.

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But don't be disheartened, and don't let author make you fell stupid or inadequate.

不过,千万别气馁, 不要让作者把你搞迷糊了,令你觉得自己象傻瓜一样.

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