1·But he doesn't want to do so in the U.S. because assuming a new job or even changing titles within his own company would nullify his existing green card application.
但他不愿在美国做，因为，换了新工作、甚至在原公司职位变了都会取消其现有绿卡申请。
2·Removal of core data object does not nullify all of its relations?
核心数据对象去除不取消所有的关系？
1·If the table condition cannot be maintained due to objective reasons, referee or the organizer shall inform the player and nullify this rack, a new rack will be played when everything is ready.
如客观原因造成球局无法被保持原状，裁判或赛事组委会有权在适当的时候告知选手此局作废，待比赛能顺利进行时重新开始新的一局球。