It can loosely be described as travel that takes place at regular intervals-often in an annual cycle-that may involve many members of a species, and is rewarded...
Television repairman was a common occupation.这句话中的主语是否应该用复数,如果不用复数也应是the+television repairman或a+television repairman表示泛指,但是这句话中的主语为什么只用单数,难道这里的telev...