n.

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

   建築工人為了防護而帶金屬頭盔。

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

   一件單薄的夾克衫不足以禦寒。

3. 保護貿易制度（或政策等）[U]
4. 通行證；護照[C]
5. 【俚】（歹徒所勒索的）保護費[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.