词典释义：
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That part left over after the tasty bit, the top half, had been scoffed by them, which is where the term "upper crust" is thought to have been born.
取出好吃的部分，也就是上面的那一半，剩下的那部分，也就是被他们嘲笑的那些，这也就是"上流社会"这个词的由来了。
《Baul Hollywoods Bread》《保罗教你做面包》
双语例句
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There is oil storage in some areas of the upper crust.
地壳上层部分地区有石油储存。
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The ore lead in the deposits mainly came from the upper crust.
矿床的矿石铅主要来自上地壳。
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The tektite was formed from the upper crust rocks by impact melting.
玻璃陨石是地壳岩石受撞击熔融形成的。
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Eton is a school that only the children of the upper crust can afford.
伊顿公学是一所只有上流社会的子弟才上得起的学校。
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Depths of these hypocenters concentrate at about 12km deep in the upper crust.
这些震源深度集中在地壳上部约12公里处。