以下为句子列表：
英文: A rounded protuberance formed by the bones in a joint.
中文: （屈指时）指节膨出部关节中由骨头形成的圆形突出物
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英文: A small protuberance on a stem or branch, sometimes enclosed in protective scales and containing an undeveloped shoot, leaf, or flower.
中文: 芽，萌芽茎或枝上小的隆起物，有时被包在保护性的介壳中，内中有未发育的根、叶子或花
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英文: A small protuberance or elevation, as from an organ, a tissue, or a structure.
中文: 隆起物，凸出物（器官，组织或结构上的）小隆起或凸出物
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英文: It consists of an air-filled protuberance on each side of the pollen grain developed by the separation of the exine layers, giving the pollen a characteristic winged appearance.
中文: 它是花粉粒外壁向外扩展而形成的囊状结构，在花粉粒两侧呈翅状，其内充满空气。
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