Sorry,You can't add this user as an admin because they are not a member of this group and you can'tare not allowed to add this user as an admin because they are not a member of this group and you are not allowed to invite them.
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抱歉，您不能將此用戶新增為管理員，因為對方不是此群組的成員，您沒有權限邀請對方。
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