他会用一贯那种自信语气微笑着自夸，他有睡觉的天赋。

He had a gift for sleeping, he'd boasted, smiling in that cocksure way of his.

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他的语气变得自信干练而务实。

His tone became brisk and businesslike.

《牛津词典》

这可能是一个信息丰富、经过充分研究的观点，但它仍然是一个观点，因此，应用试探性的语气谈论，并稍微减少一点你的自信。

It may be a well-informed, well-researched opinion, but it's still an opinion, so talk tentatively and slightly understates your confidence.

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