In addition to a necessary and sufficient condition provided in our paper, it's equally important that we have introduced a new approach to discuss the matter.仅供参考，望能帮助到你，呵呵！...
in our treatise, not only to give a necessary and sufficient argument , but alsoto introduce a new way which is the same important to us to discuss this issue ....
In our paper , in addition to give a necessary and sufficient condition , but equally important is that we introduced a new way to discuss this issue ....
