名词
中文翻译：红线
同义词：
['border', 'line', 'demarcation']
例句：
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1.The soldiers dug a redline to protect their position.
士兵们挖了一条红色警戒线来保护他们的阵地。
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2. The redline was drawn at the border between the two countries.
两国之间的红线被划定了。
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3. The redline is a symbol of national pride and unity.
红十字是民族自豪和团结的象征。