名词
中文翻译：孵化覆盖物
同义词：
['eggshell', 'eggcase', 'eggcover', 'birdcage']
例句：
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1.The hen carefully laid her eggs in the nest.
母鸡小心翼翼地把蛋放在窝里。
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2.The bird's egg is protected by a hatch cover.
鸟蛋被一个孵化覆盖物保护着。
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3. The eggshell is made of calcium carbonate.
蛋壳是由碳酸钙制成的。