But, of course, talking does not guarantee agreement, and there are a number of contentious issues that could arise during the trip.
但是，对话当然不能保证双方达成一致，而且在访问过程中可能有一些有争议的话题出现。
The idea that someone should not be punished if their abnormal neural make-up leaves them no choice but to break the law is contentious but not new.
如果某人触法源于异常的神经构造使人别无选择，那么这人就不该受罚，这种观点有争议，却非新鲜事。
NATO enlargement has been a contentious issue at times, not only among NATO members, but also with Russia, which sees the expansion of the alliance eastward as a threat.
北约扩展的行动已经多次引发争议，不仅在北约成员之间，还和俄罗斯发生争论。俄罗斯将北约向东扩展的行动看成是一个威胁。
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