1. He gives the bank his signature.
    他把自己的签名字样给银行,

2. He gives the bank specimens of his signature, and there is a very firm rule that the bank has no right or authority to pay out a customer´s money on a cheque on which its customer´s signature has been forged.
    他把自己签名的样本交给银行，对此有一条非常严格的规定：银行没有任何权利或理由把储户的钱让伪造储户的支票取走。

3. It makes no difference that the forgery may have been a very skilful one: the bank must recognize its customer´s signature.
    即使伪造得很巧妙，也不能付款，因为银行有责任辨认出其储户的签名。