华盛顿和北京一直在南中国海上上航空和海洋权益意见不一致，南中国海是重要航线云集之地，而北京声称对几乎整个南海都拥有主权。
Washington nand Beijing have long disagreed over aviation and maritime rights in the strategic South China Sea, the site of key shipping routes, which Beijing claims almost in its entirety.
多年来，研究人员一直在尝试建立对更多常识拥有理解力的系统，结果也不一而足。
For years researchers have attempted to build systems with a more general "common sense" understanding, but have had mixed results.
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