One of the greatest breakthroughs for professional women came in 1973 when the field of banking opened up for them.

Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.

Some children display an unquenchable 难以抑制的 curiosity about every new thing they encounter.

Comets are still regarded with awe by some people.

With lasers scientists can probe many physical processes, such as combustion, once beyond our ken.视野