backcross的复数形式怎么写

backcross的第三人称单数（三单）为：backcrosses...

backcross的现在完成时为：backcrossed...

A burro is carrying salt of one large bag backcross a river.有一头驴子驮着一大袋子盐过河.The method can be conveniently applied to practical backcross breeding programs.该方法可以很方便地应用于实际的回交育种....

backcross的现在进行时为：backcrossing...

backcross的音标：backcross的英式发音音标为：[bækk'rɒs]backcross的美式发音音标为：[bækk'rɒs]...

n.回[逆]交，回交杂种vt.使回交vi.回交...

backcross的一般过去时为：backcrossed...