storm cycles
风暴周期
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Storm frequency,he says, comes in cycles of 30 years.
VOA: standard.2009.12.21
Now Hurricane Sandy will slam the east coast of the US 21 years (three cycles of seven years) to the day of the anniversary of the Perfect Storm back in 1991.
FORBES: 7 Year Storm Cycle: Katrina, Isaac, Hurricane Sandy And The Perfect Storm
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