boundary: n.边界,疆界,限界 (between);(球场)边线;界标;界限,范围,分野。 aboundary dispute 边界纠纷。 the boundary between Canada and the United States 美加国界。 boundaries on all sides 四方辐辏之所,四通八达。
problem: n.1.问题,课题;疑难问题;令人困惑的情况。2.【数、物】习题;作图题。3.(象棋的)布局问题。短语和例子the problem of unemployment 失业问题。 His whole conduct is a problem to me. 他的一切行为我都不理解。adj.1.成问题的;难处理的。2.关于社会问题的。短语和例子a problem child 【心理