In the event that a lawyer or an agent is appointed to handle the arbitration matters, a letter of authorization shall be submitted to the arbitration commission.
委托律师和其他代理人进行仲裁活动的，应当向仲裁委员会提交授权委托书。
2
You should attach to the return a copy of the relevant power of attorney or letter of authorization if this is the first time you act as agent.
假如你是首次以代理人身份代业主签署报税表，你必须把有关物业的授权书副本，随报税表提交。
3
To do that the agent must obtain beforehand a certificate from the unit that delegates the authority and sign the contract in the unit's name and within the limits of authorization.