In1861itseemedinevitablethattheSouthernstateswouldbreakawayfromtheUnion.

Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.

The controls of most modern airplanes can be operated either manually or automatically.

Blue－greenalgaegrowabundantlyinsaltmarshes.

Cream of tartar 酒石 , a weak acid, can be added to egg whites to help them foam泡沫 when they are beaten