specialist

Since the patient had persistent heart pain, his doctor referred him to a cardiac specialist.

(Chinese) 由于病人持续心脏疼痛，他的医生把他转诊给了一位心脏病专家。

The company hired a cybersecurity specialist to protect their servers from hacking attempts.

(Chinese) 公司聘请了一位网络安全专家，以保护他们的服务器免受黑客攻击。