... frontier n. 国境，边界 frontier incidents 边界争端 frown at sb. 对某人皱眉 ...
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四级词汇也要天天背:by 搏_第(31)页_挂号 ... a frequent visitor 常客 frontier incidents 边界争端 There was a deep frown on his forehead. 他深深皱着眉头. ...
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四级词汇也要天天背:by 搏_第(31)页_挂号 ... a frequent visitor 常客 frontier incidents 边界争端 There was a deep frown on his forehead. 他深深皱着眉头. ...
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... border incident边境事件 frontier incidents边境纠纷 in an incident在事件中 ...
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