Can you cash this postal order for me now?

你现在能帮我兑现这张邮政汇票吗?

It is a bill payable at sight.

那是一张见票即付汇票。

You need an official signature to validate the order.

你要有正式,这张汇票才能生。

"An indorsement in blank specifies no indorsee, and a bill so indorsed ecomes payable to bearer."

无记名背并不背人，以此方式背之汇票，应成为以持票人为收款人之汇票。