现在这个神秘的声音变得更加明显了，他们不得不去弄清楚。

Now this mysterious sound became more pronounced, and forced a recognition.

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印刷良好的书籍有明显而清楚的印痕。

The well-printed book has a sharp, clean impression.

《新英汉大辞典》

虽然未来变暖的程度我们尚未清楚，但是很明显，人类活动是最大的因素。

And though the magnitude of any future warming remains unclear, human activity seems the most likely cause.

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