你认为支付宝对于付款安全起到了保障作用。

You think Alipay play the security role in the safety of pay.

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对于现金付款，我们给九折优惠。

We give a ten percent discount for cash payment.

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对于模拟食品杂货店，我们感兴趣的进程是在通道处付款的顾客。

For the grocery store simulation, the process we are interested in is a customer who checks out at an aisle.

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