(plural) an organization that catches thieves, killers, etc. and makes sure everyone follows rules
警察
to study a subject carefully and systematically to discover new facts or information about it
研究
a piece of writing about a particular subject on a website, in a newspaper, magazine, or other publication
文章
an agreement between two or more parties, typically involving the exchange of goods, services, or property
协议
to form, produce, or prepare something, by putting parts together or by combining materials
做
details about an event or series of events presented through writing, drama, cinema, radio, or television, typically to entertain or inform an audience
故事
something that is hard to explain or understand, often involving a puzzling event or situation with an unknown explanation
神秘
the initial price set by a seller for a product or service, which may be subject to negotiation
要价