A natural way to think of it would be analogous to the saffir-simpson hurricane scale that is based on maximum sustained wind speed.

一种自然的思考方式是比照基于最高持续风力的萨菲尔—辛曾森飓风等级。

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And when those winds reach 156 miles per hour, you're dealing with a category 5 hurricane. Those are the highest on the Saffir-Simpson scale.

四级飓风是131英里每小时以上风速，如果风速达到156英里每小时，你面对的是5级飓风，这是撒佛-辛普森等级的最高等级。

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Scientists use the Saffir-Simpson Hurricane Scale to measure the intensity of storms based on wind speed.

VOA: special.2010.08.24

The forecast said three to five of the hurricanes will be major storms ranked Category 3 or higher on the Saffir-Simpson scale of hurricane strength.

CNN: NOAA predicts two or three hurricanes to hit U.S.

In a report released Tuesday, CSU's Tropical Meteorology Project (TMP) forecast half of those hurricanes will develop into major hurricanes ranked as Category 3 or higher on the Saffir-Simpson scale of hurricane strength.

CNN: 'Very active' hurricane season forecast

The Saffir-Simpson scale assigns a storm a number between 1 and 5, with "1" being a weak hurricane and "5" the strongest.

CNN: Hurricanes -- slow, methodical, deadly