买主在付款前也许需要更多的保证。
Buyers might require further assurances before parting with their cash.
因为是先付款，一些商品的质量难以保证。
Also the quality of the goods is not guaranteed, as we must pay first.
保证合同防范的是承包商违约风险，主要包括投标保证、履约保证和付款保证。
There are three main forms of surety bond: bid bond, performance bond and payment bond.
一如往常，会员是免费和付款保证。
许多合同里都有保证将来分几次付款的诺言。
Many contracts involve promises to pay sums of money in the future.
许多合同里都有保证将来分几次付款的诺言。
Many contracts involve promises to pay sums of money in the future.
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