名词

1. 限制;约束;规定
A restriction is an official rule that limits what you can do or that limits the amount or size of something.

2. （对行动的）限定，约束，限制因素
You can refer to anything that limits what you can do as a restriction.

3. see also: restrict

1. an act of limiting or restricting (as by regulation)

Synonym: limitation

2. the act of keeping something within specified bounds (by force if necessary)

e.g. the restriction of the infection to a focal area

Synonym: confinement

3. a principle that limits the extent of something

e.g. I am willing to accept certain restrictions on my movements

Synonym: limitation