许多捐赠者没有仔细评估资金的相对长期成本和收益，就匆匆忙忙地投资一些花哨的项目。

Many donators have rushed into fancy programmes without carefully assessing the relative long-term costs and benefits of their money.

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这类产品重量大、体积大，运输它们的成本也相对较高。

These sorts of products are heavy and bulky and the cost of transporting them relatively high.

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与其他方法相比，生物防治的优点是它提供了一种成本相对较低、有害副作用最小的永久性防治系统。

The advantage of biological control in contrast to other methods is that it provides a relatively low-cost, perpetual control system with a minimum of detrimental side-effects.

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They will do it as long as the home price is high relative to their construction costs.

只要房价相对建筑成本有利可图,建造商们就不会停止步伐

耶鲁公开课 - 金融市场课程节选