Except for a few gratuitous successes, which I am prepared to admit, systematiccross-breeding has never produced good results.
除了少数无偿成就，我很乐意承认，有系统的杂交育种，从未产生了良好的效果。
2
A completed and systematic acceptation could be investigated from three directions, that is, vertical association, horizontal association and cross association.
词义的完整系统性当从词义的纵向联系、横向联系、纵横交叉联系三个方向进行探讨。
3
Summary: a new rigorous systematic design procedure for folded waveguide filters with cross couplings is presented.