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.
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