It is probably a result of crossbreeding.
它可能是杂交繁殖的结果。
But traditional crossbreeding is a slow process.
但是，传统的杂交育种是一个缓慢的进程。
Therefore it is suitable to use the process of crossbreeding to increase their contents.
因此要提高它们的含量宜采用杂交育种途径。
Therefore it is suitable to use the process of crossbreeding to increase their contents.
因此要提高它们的含量宜采用杂交育种途径。
应用推荐