In 2005, a NASA science mission called Deep Impact crashed an 816-pound copper mass into a comet to learn more about its icy interior.

2005年，美国宇航局的一项叫做深度撞击的科学任务，是用一块816磅重的铜质物体撞击一颗彗星，以了解其内部更冰冷的物质。

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The human brain is a 3-pound (1.4-kilogram) mass of jelly-like fats and tissues-yet it's the most complex of all known living structures.

人脑是一堆大约重达3磅(1.4公斤)的啫喱状物质，就像脂肪和其他组织一样，目前它还是已知的身体结构中最复杂的。

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Knowing when to harvest the agave's heart--the 50-to-80-pound mass from which juices are extracted--is an art.

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Undoubtedly, the first thing you'll notice is the mass of the 62.9-pound (28.6 kg) kit.

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