四种不同的化学反应主导了工业界——当考虑到效用、耐用性、成本、安全性和性能时，它们中的每一种都有优劣之分。
Four different chemical reactions dominate the industry-each of which has pros and cons when it comes to utility, durability, cost, safety and performance.
针灸用针能够刺激细胞产生腺苷酸，这是一种能够消炎止痛的化学物质，其效用在施针结束后一个小时达到峰值。
The needles stimulated cells to produce adenosine, an anti-inflammatory and painkilling chemical, that was effective for up to an hour after the therapy was over.
1948年的10月28日，瑞士化学家保罗·穆勒因发现滴滴涕的杀虫效用而被授予诺贝尔化学奖。
October 28, 1948, Swiss chemist Paul muller is awarded the Nobel Prize in Chemistry for his discovery of the insecticidal properties of DDT.
鉴于这些化学物质都是比二氧化碳更有危害性的温室气体，这一效用同样有助于抗击全球变暖。
Since both of these chemicals are more potent greenhouse gases than carbon dioxide, this effect, too, should help combat global warming.
强化学习是这种情况下的常用技术，而更多的传统情形下需要使用效用函数。
Reinforcement learning is a common technique for this scenario as well as the more traditional scenario of actually learning the utility function.
他说他们的小组正在实验四种不同的PROVECTOR原型，以便得到最佳的颜色和化学物质的组合-前面没有提到的是，这种人造花在失去效用后，花瓣是可以生物降解的。
He says his team is testing four different prototypes of PROVECTOR to come up with the most effective mix of color and chemicals-not to mention, disposable petals that are biodegradable.
评估市售或由牙医师提供含化学成份之牙齿美白产品的效用(与安慰剂或其他有效的产品相比较)以及副作用。
To evaluate the effectiveness (versus a placebo or another active product) and side effects of over-the-counter or dentist-dispensed chemically-based tooth whitening products designed for home use.
统计了《分析化学》期末考试选择题、填空题的难度和区分度，评价了试题质量，总结了考试整体结果，讨论了试卷分析的实施和效用。
The passage talks about the statistics method for quality analysis of test paper specifically by making use of mathematical statistical principle.
统计了《分析化学》期末考试选择题、填空题的难度和区分度，评价了试题质量，总结了考试整体结果，讨论了试卷分析的实施和效用。
The passage talks about the statistics method for quality analysis of test paper specifically by making use of mathematical statistical principle.
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