The function of the thymus was unknown until relatively recently.

直到不久以前，人们对胸腺的功能尚不明了。

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But until relatively recently we've known little about its true nature.

可一直到最近，我们才开始了解它的真实状况。

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But until relatively recently we've known little about its true nature.

可一直到最近，我们才开始了解它的真实状况。

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