n.回[逆]交，回交杂种
vt.使回交
vi.回交
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.
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.
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