Natural Occurrence—Lemon, grapefruit, nutmeg, carrot, raspberry and celery root .

天然桧烯天然存在：在柠檬，圆柚，肉豆蔻，胡卜，覆盆子，芹菜根里找到。

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Resource endowment — the natural occurrence of resource in the earth's crust and atmosphere.

资源自生——在地球地表和大气层中自然出现的资源。

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At some point later, through natural occurrence or human intervention, that tree became horizontal.

稍晚的时间，因为自然过程或者人为干涉，树倒了。

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The EAW said the heat-related deaths were a natural occurrence, not uncommon, which started in Mid May.

BBC: Cockle deaths blamed on weather

The mutation is a natural occurrence, as is the reaction to the drug.

ECONOMIST: America��s Supreme Court wallops the biotech industry

Conservative lawmakers will acknowledge that global temperatures are rising but say that such a phenomenon is a natural occurrence, not man-made.

FORBES: Obama's Sly Attack on Climate Change