mandatory
/ˈmændəˌtɔri/
the recipient of a mandate
Chinese meaning: 受委托人;代理人
The mandatory acted on behalf of the principal in the legal dispute.
受委托人在法律纠纷中代表委托人行事。
As a mandatory, he had to follow the instructions given by the client.
作为受委托人,他必须遵循客户给出的指示。