名词
中文翻译：胚珠
同义词：
['ovule', 'ovary wall', 'embryo sac']
例句：
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1.The plant's cystocarps are the reproductive structuresthat produce seeds.
这种植物的胚珠是产生种子的生殖结构。
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2. During pollination, the male and female parts ofthe flower meet to produce cystocarps.
在授粉过程中，花的雄性和雌性部分相遇以产生胚珠。
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3. The cystocarps are surrounded by a protective layerof tissue called the gynoecium.
胚珠被一层称为雌蕊的组织保护层包围。