A barrier is a structure or object that blocks or restricts movement, access, or passage. It is typically designed to keep people, animals, or objects from crossing a specific boundary. Barriers can include fences, walls, gates, and bollards, and they are commonly used for security or privacy. These barriers can be found in places like construction sites, roads, airports, or private properties. They are also used to prevent accidents, such as barriers along highways or in areas with dangerous conditions.

英語での「barrier」の定義と意味

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