第二十期 4-1(4/7)-英语听力

[00:00.00]The great power of hurricane is almost unbelievable. [00:04.62]The speed of this wheeling funnel-shaped wind may be more than 600 miles per hour. [00:11.39]It can tear up trees, carry buildings away, and even lift large trucks on the highway. [00:18.09]The hurricane is like giant vacuum sweeper that sucks up anything in its path. [00:24.16]Experts believe that the most violent force of a hurricane is found inside the funnel, [00:30.47]where a vacuum is created because of very low air pressure. [00:34.49]When this vacuum moves over a building which is filled with air under normal pressure, [00:39.90]the difference between the air pressure inside the building and that outside causes the building to explode. [00:47.14]The largest hurricane on record had a funnel a mile wide.