"Rats are harmful to people."
"Harmful" is the word used to describe something that causes damage, injury, or injury to people.
Example sentences in Engpsh:
"Rats carry diseases that can be harmful to humans."
"Rats can cause significant damage to crops and property."
Translated into Chinese:
"老鼠携带疾病，对人类有害。"
"老鼠可以对农作物和财产造成重大损害。"