Bone pain may occur in the absence of a pathological fracture or vertebral collapse, but it becomes worse when this occurs.

骨痛在没有病理性骨折或脊椎塌陷的情况下也会发生，但在这两种情况发生时变得更为严重。

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Wisdom teeth commonly affect other teeth as they develop, becoming impacted or "coming in sideways". They are often extracted when this occurs.

智齿在生长的过程中通常会影响到其他牙齿，成为阻生牙或异位，这时候通常要拔除智齿。

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When a vehicle is running along a wet runway, the phenomenon of hydroplaning might happen, and when this occurs, the vehicle will lose its orientation in direction, leading to disasters.

轮式车辆或起降的飞机在积水的跑道上行驶或滑行时，会因滑水而导致失去行驶方向，其危害是相当严重的。

youdao

"So,when an event like this occurs, it is incumbent upon a Democrat to react quickly and decisively, and Obama failed to do it."

VOA: standard.2010.01.06

This is when it first occurs to her that the whole world is being organized around her: Nothing of the night's could touch her. Nothing did.

这是她第一次意识到,她周围的整个世界是被安排好的：,那一夜没有什么能够触动得了她，没有。

耶鲁公开课 - 1945年后的美国小说课程节选

When I think about this situation, an analogy always occurs to me.

每当我想到这种情境时,总会联想到一个类比

耶鲁公开课 - 死亡课程节选

When this occurs companies are risk remaining where they are rather than what they might become.

FORBES: Second Inaugural Address: A Lesson for Executives

When this occurs, I may have to delay my patients' appointments to tend to them.

CNN: Long wait at the doctor's office? Blame the patients

When this occurs, it's called chronic upper airway cough syndrome (or postnasal drip).

CNN: Mystery cough? 8 possible culprits