一种产于美洲的紫露草属草本植物，尤指弗吉尼亚紫露草，生有三瓣的蓝色或紫色花朵和六个毛状雄蕊。
Any of various New World herbs of the genus Tradescantia, especially T. virginiana, having three-petaled blue or purple flowers with six hairy stamens.
作旋转的肾脏线和旋转的三瓣外摆线，且彼此维持正交。
Construct rotating nephroid and three-cusped epicycloid while remaining orthogonal to each other.
圆溜溜的大眼睛下面长的是它别具特色的三瓣嘴；
Under the big round eyes long is it distinctive three petal mouths;
圆溜溜的大眼睛下面长的是它别具特色的三瓣嘴；
Under the big round eyes long is it distinctive three petal mouths;
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