It has often been loosely said that all our races of dogs have been produced by the crossing of a few aboriginal species . 有人常常随意地说，我们所有的狗类品种，都是由少数原种杂交所产生的。
Such notable professionals as john rivers hybridized various tree fruits, and introduced superior clones from france and elsewhere . 著名的专业工作者如JohnRivers对各种果树进行了杂交，并从法国和其他地方引进优良的无性系。
Individuals crossing exclusively within the same population produce more progeny than those crossing in both directions and thereby use up some of their gametes for the production of inviable hybrids . 完全在同一种群内进行杂交的个体比以两个方向进行杂交的个体繁殖后代要多，因此为了产生无生机的杂种，就要消耗掉一些配子。
Key to guarantee hybrid maize production quality 确保杂交玉米制种质量的关键措施
The organism resulting from cross - fertilization 杂交体：源于异体受精的生物体。
Breeding measures of transforming qinchuan cattle 谈秦川牛转型选育及杂交利用方式
