The noise spikes seem to occur a little less frequently.

噪音峰值出现的频率似乎要低一些。

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But recent research has suggested they would occur less frequently, though likely to pack a more powerful punch each time.

但最近的研究已标明这些情况不会那么经常发生，虽然每次发生都破坏力巨大。

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These behaviours tend to occur most frequently in rural areas where populations traditionally slaughter and consume birds once deaths or signs of illness are seen in poultry flocks.

这些行为往往最经常发生在农村，那里的人口在传统上一旦在禽群中发现死亡或疾病征兆就屠宰和食用禽鸟。

youdao

If your child has a severe reading disability, tutoring may need to occur more frequently, and progress may be slower.

CNN: Dyslexia

But a far bigger challenge lies ahead: preparing for a future in which storms like Sandy and Irene are likely to occur more frequently.

FORBES: Preparing For The Next Sandy

"Honor killings" -- the slaying by family members of a woman or girl thought to be bringing them shame -- are usually kept quiet, making it difficult to determine how frequently they occur.

CNN: Dad charged with murdering reluctant bride