despeciation,degeneration,despeciate,degenerate是什么意思

用法例句

Breed characteristics, reproduction performance, growth and development and beef performance, biological characteristics and adaptability of Brahman were introduced in detail.

本文较详细地介绍了世界优良瘤牛品种——婆罗门牛的品种特征、繁殖性能、生长发育特点和产肉性能 ,以及其主要的生物学特性和适应性。

Comparisons on variety characters and turf performance of different turf grasses in Nanjing area;

采用环境适应参数及坪用性评价指标对12种草坪草在南京地区建植过程中的品种特性,成坪质量及坪用性状进行了系统研究。