名词
中文翻译：花萼
同义词：
['calyx', 'corolla例句：1. The involucre of the flower is a protective casing for the petals.（花朵的花萼是花瓣的保护壳。）2. The involucre is made up of several layers of petals and sepals.（花萼由几层花瓣和萼片组成。）']
例句：
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1. The involucre of the flower is a protective casing for the petals.
花朵的花萼是花瓣的保护壳。
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2. The involucre is made up of several layers of petals and sepals.
花萼由几层花瓣和萼片组成。
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3.The involucre is where the pollen grains are stored until they are released during pollination.
花萼是花粉粒储存的地方，直到授粉时释放。