These snails do not occur on low-lying coral islands.

这些蜗牛不会出现在低洼的珊瑚岛上。

《柯林斯英汉双解大词典》

They do not occur in a decided frequency, but rather through a special modulation, the radio waves identity.

他们通常不发生在确定的频率，而是通过一个特定的调治，来确定无线电波。

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"Two of these chemicals do not occur naturally, and would have taken 30 days of hard work to make," Amatore said.

“并不是任意两种化合物都会发生这样的化学反应，经过三十天的艰苦工作，才生产和发现了这样的化学物品。”Amatore说。

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So, he writes: To the psychologist alone can such questions occur as: Why do we smile when pleased and not scowl?

他这样写到：,对哲学家本身说,会出现这些问题：,为什么开心时我们微笑而非皱眉？

耶鲁公开课 - 心理学导论课程节选

Now I'm not going to hear, pursue of the question of "Do we believe bodily resurrection occurs or will occur?"

现在我不需要，大家一直争论,我们是否要相信,肉体复活是否会发生“

耶鲁公开课 - 死亡课程节选

Widespread closures do not occur overnight or even within a few weeks of a price tumble, he said.

FORBES: Some Aluminum Production Dips Below Costs; Output Cuts Likely If Condition Persists

Those approaches are mostly based on so-called metamaterials, man-made materials with properties that do not occur in nature.

BBC: Acoustic 'cloaking device' shields objects from sound

Their problems do not occur in isolation, but are manifestations of failures to which all Americans contributed together.

CNN: America's gun problem is not a race problem