Another reliable source of regional tension is the hazy maritime frontier between Malaysia and Indonesia.

马来西亚和印度尼西亚在领海分界线上的纠缠不清则是地区紧张的另一个可靠来源。

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It mainly includes the maritime and frontier interpretation.

起源问题主要包括海洋解释和边境解释。

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And in the past five years, maritime border crossings into the United States have become a "new frontier, " said David Shirk, a professor of political science at San Diego State University and an expert on Mexico and border security.

CNN: Mexico: Traffickers abandoning immigrants at sea