在拒绝将效用作为价值量度的同时，他们形成了价值的劳动成本理论。在该理论中，效用被认为是价值的基础或先决条件，但不是价值的量度。
In rejecting utility as a measure of value, they arrived at a labor cost theory of value, wherein utility was regarded as a condition or prerequisite of value but not as a measure of it.
安装工程开工前的技术准备工作非常重要，它是保证工程进度、工程质量、降低工程成本、搞好现场HSE管理的先决条件。
Technical preparation work is very important, and it is a precondition of ensuring project progress and quality, decreasing project cost and offering good field HSE management.
模具的短周期、高质量和低成本是企业参与市场竞争的先决条件。
Short period, high quality and low cost of dies are premier conditions on which enterprises participate in market competition.
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