My boss gives me a free hand in deciding which outside contractor to use.

老板让我自主决定聘用哪家外部承包商。

We got estimates from three different contractors before accepting the lowest.

我们得到三个承包商报价后, 接低报价。

Contractors winning construction jobs had to kick back 2 per cent of the contract price to the mafia.

赢得建筑工作承包商得抽出价百分之二回扣给黑手党。

Therefore in the construction contract uses the advanced payment, the contractor may exercise unassured pleadings to guard project funds is delayed in payment.

因此，在适用预付款中，承包商可以行使不安抗辩权，以防范工程教拖欠。