英语语法分析

Funnel clouds become tornadoes once they touch the ground.

漏斗云一旦接触到地面就会变成龙卷风。

They're making the house that can fight against tornadoes that's why it has an unusual shape.

他们建造的房子可以对抗龙卷风，这就是为什么它有一个不寻常的形状。

272 tornadoes swept the nation in the first half of this month – already breaking the all-time twister-count for April.

272例龙卷风在本月初席卷全国——已经打破了四月份的龙卷风案例。