expert
🇺🇸
/ˈekspɜːrt/
🇬🇧
/ˈekspɜːt/
a person who knows a lot about something
The expert helped us understand the problem.
這位專家幫助我們理解了問題。
done with great skill or knowledge
She gave expert advice on the matter.
她在這個問題上給出了專業的建議。