If not, it is not plausible that the variable is a causal factor.
如果不是，变量是一个因素这说法就是不合理的。
Howard J. Feldman, the director of regulatory and scientific affairs at the American Petroleum Institute, noted that the evidence of a causal factor was inconclusive for some ailments.
美国石油研究所负责监管和科学事务的所长霍华德j·费尔德曼指出，证据表明废气对某些疾病的发生并不起决定性作用。
H. pylori infection is recognized as a causal factor in the pathogenesis of chronic gastritis, peptic ulcer, gastric cancer, and gastric MALT lymphoma.
幽门螺杆菌感染被认为是慢性胃炎、消化性溃疡、胃癌和胃malt淋巴瘤发病机制中的一个必然因素。
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