He cracked his head on the pavement and was knocked cold.

他的头撞着了路面，撞昏了。

《柯林斯英汉双解大词典》

This was the first time I struggled to learn a song, because my voice cracked as I switched to a head voice.

这是我第一次学歌学得这么艰难，因为我在换成头声唱歌时破音了。

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But at last the shells cracked, one after another. One little head after another appeared.

最后，一个一个的蛋壳终于裂开了，一个又一个的小脑袋也露了出来。

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And although at first, upon waking, I always cracked my head against the deck above, I developed the habit of passing from deep sleep to full attention in an instant.

开始，有风浪时，我总是把头碰到上面的甲板。我逐步养成了习惯，可以在熟睡时，突然完全清醒过来。

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And although at first, upon waking, I always cracked my head against the deck above, I developed the habit of passing from deep sleep to full attention in an instant.

开始，有风浪时，我总是把头碰到上面的甲板。我逐步养成了习惯，可以在熟睡时，突然完全清醒过来。

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