Typical of the grassland dwellers of the continent is the American antelope, or pronghorn.
Of the millions who saw Haley’s comet in 1986, how many people will live long enough to see it return in the twenty-first century.
Anthropologists have discovered that fear, happiness, sadness and surprise are universally reflected in facial expressions.
人类学家们已经发现 恐惧、快乐、悲伤和惊奇都会形之于色 这在全人类是共通的。
Because of its irritating effect on humans, the use of phenol as a general antiseptic has been largely discontinued.
In group to remain in existence, a profit-making organization must, in the long run, produce something consumers consider useful or desirable.
The greater the population there is in a locality, the greater the need there is for water, transportation, and disposal of refuse.