Areas key to PLAN modernization include antisubmarine warfare (ASW), shipborne antiair warfare (AAW), and sustained naval operations.
解
现代化的区域性关键环
包括反潜战，舰艇防空作战，
续的上作战。
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So when, in 2005, a paper in Nature reported, on the basis of the five pertinent shipborne surveys which had been made since 1957, a 30% drop in the volume of AMOC between 1992 and 2004, there was serious concern.
因此，2005 
，《
然》杂志
一篇论文根据 1957 
来
行
相关船载调查报告称， 1992 至 2004 间 AMOC 数量下降了 30%， 引起了严重关注。
