讲义
常用复数名词

pants, glasses, socks, shoes, scissors

单数名词(结尾有-s，但是是单数名词)

news, lens, mathematics, politics, physics

单复数意义不同

good/goods, glass/glasses, cloth/clothes, wood/woods

数目字

two hundred people, three thousand students,

two dozen bottles of beer, a three-year-old child, in the 1960s