1·Cancellation of a trademark is also known as "Nullity Action" in several Latin American jurisdictions. It can be based in several available absolute grounds.
取消某一商标，因为该商标在许多拉美国家被认为是“无效的”。下面几个是绝对理由。
2·Nullity of Marriage is a social phenomenon commonly exists in reality. It is also a kind of illegal civil relation.
无效婚姻是现实生活中较为普遍的一种社会现象，同时也是一种违法的民事关系。
1·In Section 4, we study the nullity functions of poset matroids.
在第4节研究了偏序集拟阵的零度函数。
2·Then by means of maximum matching number we give aformula to calculate the nullity of unicyclic graphs.
第三章主要给出计算单圈图的零度的公式。