引发癌症的原因多种多样，包括放射线辐射、化学物刺激以及病毒感染等，不同个体对诱发癌症的外因有不同程度的抵制能力。
There are many different causes, ranging from radiation to chemicals to viruses; an individual has varying degrees of control over exposure to cancer-causing agents.
最近有三名国会议员就破裂法发表报告，报告指出，2005—2009年间石油和天然气公司使用的2500多种破裂材料含有750种化学物，有些成分是对人体无害，如柠檬酸、速溶咖啡。
Three members of Congress recently released a report on fracking, saying that oil and gas companies used more than 2,500 fracking products containing 750 chemicals between 2005 and 2009.
我们在这说的燕窝是由多种雨燕生产出来的，尤其是金丝燕在做巢时会排放一种化学混合物，使空气变冷。
The nests in question here are produced by a variety of Swifts, specifically Cave Swifts who produce the nest by spitting a chemical compound that hardens in the air.
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