legitimate

The officer asked to see her passport to confirm that her presence in the country was legitimate.

(Chinese) 警官要求查看她的护照，以确认她在该国的逗留是合法的。

Customers have a legitimate reason to be angry if the product they purchased is broken.

(Chinese) 如果购买的产品是坏的，消费者有正当的理由感到愤怒。