肿大的前列腺并不一定表明癌症的存在。

An enlarged prostate does not necessarily mean cancer.

《柯林斯英汉双解大词典》

例如，做过股票交易所价格实验的曼德尔布洛特指出，尽管结果是可变的，但实际上存在一定的一致性。

Mandelbrot, who did the experiment with stock exchanges prices, for example, noted that although the outcomes were variable, there were, in fact, certain constancy.

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虽然这些化学物质的简单存在并不一定表明存在健康风险，但典型的美国人身上携带这些化学物质的事实让琼和他的同事感到震惊。

While the simple presence of these chemicals does not necessarily indicate a health risk, the fact that typical Americans carry these chemicals at all shocked June and his fellow participants.

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