as of + 具体日期，表示从一天开始（以及之后的时间），通常用于明确合同或补充协议的签订时间。
IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed, all as of the date first above written.
as at + 具体日期，表示在某一天。
If you are a registered holder of our ADSs as at the Record Date, the depositary, JPMORGAN CHASE BANK, N.A., (the “Depositary”) will forward to you the information of our annual general meeting and ask you to provide your voting instructions with respect to the shares represented by your ADSs.