名词
中文翻译：屏障
同义词：
['protective barrier', 'protective shield']
例句：
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1.The barrier between the two countries is too high for communication to be effective.
两国之间的障碍太高，沟通无法有效进行。
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2.The shield of the city wall protects the citizens from intruders.
城墙的护盾保护市民免受入侵者的伤害。
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3. The scientist used a barrier shield to prevent contamination during experiments.
科学家使用屏障护盾防止实验过程中的污染。