Most people are neither pro-choice nor pro-life, but both; we cherish life, we value choice, and we trade them off with great reluctance.
大部分人既不全然赞成或对堕胎，而是兼而有之：我们珍视生命，我们看重选择，我们难以轻易放弃它们。
The trade-off for participants is clear: participation drives value.
参与者的妥协很明确：参与驱动价值。
We learn in childhood that things are a value for value trade off.
我们在孩童时期就学到了每件事都是有价值的，都可以当作是谈判筹码。
Weighted value of safety quality cost time in most cases must be regarded for trade-off optimization, but it is difficult to be determined for its uncertainties.
工程施工中安全、质量、费用及工期的综合优化，在许多情况下需要涉及权重的确定，但权重值常很难精确确定，具有不确定性。
Weighted value of safety quality cost time in most cases must be regarded for trade-off optimization, but it is difficult to be determined for its uncertainties.
工程施工中安全、质量、费用及工期的综合优化，在许多情况下需要涉及权重的确定，但权重值常很难精确确定，具有不确定性。
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