With lasers scientists can probe many physical processes, such as combustion, once beyond our ken.视野
A
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Alligators still exist in some of the dank 潮湿 swamps and bayous小海湾 of Alabama's coastal regions.
The controls of most modern airplanes can be operated either manually or automatically.
Cream of tartar 酒石 , a weak acid, can be added to egg whites to help them foam泡沫 when they are beaten
The Salk vaccine is a major factor in the fight to eradicate polio.
The first paper was made from the bark of the mulberry tree.