绘出不同风速等级下，铝铆钉抗拔强度与广告牌整体倾覆易损性曲线。
Draw aluminum rivets anti-pulling strength and the overall overturning vulnerability curve.
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。
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.
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