n.便利；权宜之计；私利

=expediency.

Doing so sends a dangerous signal that moral arguments have no role in shaping the climate regime and that national expedience will regularly trump global deals. 这样做发出了一个危险的信号，即道德论据在塑造气候制度方面无法发挥任何作用，国家便利通常会打败全球协议。

The expedience of war opened the doors to American drug traffic and Mafia domination. 战争的私利就是给美军的毒品交易和黑手党的同志打开大门。