Gently tap the egg shells with the back of a teaspoon and crack the shells.

用茶匙轻轻敲打蛋壳，使蛋壳破裂。

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Artificial bone and egg shells make good building materials due to their makeup of proteins and minerals.

人造骨和蛋壳是很好的建筑材料，因为它们由蛋白质和矿物质构成。

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Researchers found that the formation of egg shells relies on a protein found only in a chicken’s ovaries, according to The Sun of London.

研究人员发现，蛋壳只有在一种蛋白质的催化下才能形成，而这种物质只存在于鸡的卵巢内。

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"Everyone feels like they have to walk on egg shells, " says Stage, who once tried to kill herself with self-inflicted cuts.

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