名词
中文翻译：障碍物
同义词：
['barrier', 'obstacle', 'barrier', 'impediment']
例句：
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1.The river is a natural barrier between the two countries.
这条河是两国之间的自然屏障。
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2.The barrier spring has been a source of concern for many years.
这个障碍物弹簧多年来一直是人们关注的焦点。
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3. The barrier spring was designed to prevent water from flowing through the cracks in the wall.
这个障碍物弹簧被设计来防止水通过墙壁的裂缝流动。