1.The boy complained to his mother that he had toothaches.
complain 抱怨
The leaflet explains how to complain to the banking ombudsman.
這份傳單介紹了如何向銀行意見調查官投訴 。
2.We have a very good counseling team who have expertise in dealing with kids.
expertise 專門知識
To grow the business, he needs to develop management expertise and innovation across his team.
為了拓展業務,他需要提高整個團隊的管理技能和創新能力 。