单语范例（未经PONS编辑处理）
英语
- Since heterostyly is characteristic of nearly all races or species, the system is at least as old as the genus.en.wikipedia.org
- It should not be confused with genetically controlled physical or temporal mechanisms that prevent self-pollination, such as heterostyly and sequential hermaphroditism (dichogamy).en.wikipedia.org
- However, heterostyly is a method of actively promoting outbreeding between unrelated plants of the same species, which generates variation in the offspring -- the fuel that powers natural selection.www.independent.co.uk
- During the twentieth century other characters were used to delineate subfamilies, e.g. stylar pollen presentation, raphides, endosperm, heterostyly, etc.en.wikipedia.org
- Another most important property of the heterostyly system is physiological.en.wikipedia.org
- Heterostyly occurs when flowers have two or three anatomical forms.www.independent.co.uk
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