n.

1. 保护，防护；警戒[U][（+against/from）]
   The construction workers wore metal helmets for protection.

   建筑工人为了防护而带金属头盔。

2. 防护物[C][（+against/from）]
   A thin jacket is a poor protection against cold.

   一件单薄的夹克衫不足以御寒。

3. 保护贸易制度（或政策等）[U]
4. 通行证；护照[C]
5. 【俚】（歹徒所勒索的）保护费[U]

n.

1. the action or state of protecting or being protected.
   ▸a person or thing that protects.
   ▸a document guaranteeing safety to the person specified in it.
2. the payment of money to criminals to prevent them from attacking oneself or one's property.