付款凭证的英文怎么说

付款凭证的英文：
a payment voucher

The players struck their boss for the payment.
球员们为要求老板加薪而罢赛。

They have guaranteed prompt payment.
他们保证及时付款。

The bank call for a moratorium on payment .
银行要求延缓款项偿付期。

This is called the down payment.
通常称为现付款。

The factory defaulted on the payment for the materials.
工厂买原料的钱迟迟不还。

She has a voucher for a free swim.
她有一张免费游泳的凭证。

I must know his voucher.
我必须认识他的保证人。

A company that vouchers employees when the payroll cannot Be met.
公司在发不出工资时给职员一定的凭证

A company vouchers employees when the payroll cannot be met.
公司在发不出工资时给职员一定的凭证。

Is it necessary for a secretary to keep a receipt while he or she holds voucher?
对于秘书来说，当手里持有收据时，还有没有必要保存凭据呢？