Volcanic eruptions are measured on the Volcanic Explosivity Index, which goes from 0 (weakest) to 8 (strongest).

火山爆发用来衡量，这个指数从0(最弱)到8(最强)。

youdao

An eight-point scale called the "volcanic explosivity index" (VEI) allows you to compare eruptions and volcanoes.

你可以通过“火山爆发指数”(VEI)来比较喷发和火山，它把火山爆发分为8个等级。

youdao

Only one explosion in recent history has made it to 7 on the Volcanic Explosivity Index – 10 times bigger than Krakatoa.

在近代历史上只有一次火山爆发达到了7级的火山爆发强度指数，它的爆炸力是喀拉喀托火山爆发的10倍。

youdao

"All the resistance training is to ensure I have physical power and can create explosivity on court to quickly react to opponents playing fast and hitting deep, hard balls, " she says.

WSJ: To Stay on Top in Tennis, Time Off Counts