We should not be too optimistic about this.

不应对此太过乐观。

youdao

Although it is natural for you to be drawn into the depths, you also appreciate days when there is a carefree and optimistic spirit around, as it reminds you not to take everything too seriously.

虽然你习惯性的把什么事情都想的很深，但是你任然很珍惜那些无忧无虑乐观的日子， 因为这提醒你不要把所有的事情都想的过于认真。

youdao

But then he gave a litany of reasons not to be too optimistic.

但是接着他又给了一长串对此不要过于乐观的理由。

youdao

So to some observers, it may not be the time to get too optimistic.

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Their assumption that the C-5 modernization effort is a suitable counterbalance to the loss of C-17 production capability is far too optimistic, as the C-5 modernization will not be completed until after 2020.

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