We get a lot of big quakes every year, and occasionally those hit near population and cause damage — it's mostly a matter of chance.

每年都会发生许多大地震，偶尔会在人口密集区发生并造成重大损失——这完全是一个概率事件。

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Often, patients do thorough, vigorous research but still end up missing essential medical basics, which delay their recovery and occasionally cause harm.

通常情况下，患者进行彻底、积极、全面的研究，但最终仍然缺乏医疗基础知识，这拖延了他们的康复、偶尔会造成损害。

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These bacteria, which belong to the same family as TB, can be found in the environment and occasionally in water supplies but rarely cause disease in healthy people.

这些细菌与肺结核（病菌）同系，可在自然环境中发现，偶尔也能在日常用水中发现，但极少给健康者带来疾病。

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One of the main reasons the Vikings parted with Harvin was the trouble the volatile 24-year-old would occasionally cause behind the scenes.

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They aim to provide the same pain relief as older anti-inflammatory medicines such as ibuprofen, without the older drugs' tendency to occasionally cause nasty ulcers.

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It also means that whereas population growth may not be a global problem, it could often be a very nasty local one, causing conflict over local resources, especially water, and privation when politics (frequently) or natural disaster (occasionally) cause local scarcity or epidemic disease even within a wider world of abundance and improving health.

ECONOMIST: A Survey of the 20th Century