Avoid (v.) 避免

keep away from or stop oneself from doing (something).

You really should avoid that place, they have a huge dog who doesn’t let people in.

Prevent (v.) 預防

keep (something) from happening.

In order to prevent people from trespassing, the owners built a large fence and got a loud dog.

Prohibit (v.) 禁止

formally forbid (something) by law, rule, or other authority.

Trespassers are prohibited from entering the property. There is a big dog to stop anyone who ignores this rule.