以下为句子列表：
英文: Heteranthery exists in several angiosperm families, such as Melastomataceae, Solanaceae, Lytbraceae, Leguminosae and Pontederiaceae, but the aspects and extent of differentiation often vary in taxa.
中文: 异型雄蕊在野牡丹科、茄科、千屈菜科、豆科、雨久花科等多个科中都有分布，但其分化与程度常随类群而异。
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英文: Nitrogen fixation trees of Leguminosae and non-Leguminosae are important biological nitrogen fixation resources.
中文: 摘要豆科及非豆科固氮树种是重要的生物固N资源。
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