a batch of mail的用法和样例：
- A batch of mail dispatched at one time by a sender.
- A batch of mail that was dispatched at one time by a carrier.
- The accountant sign a batch of cheque.
- My personal letters got muddled up with a batch of circulars.
- He ran a batch of mimeographed sheets off .
- A batch of rolled steel was allocated to us.