a quarter of a pound

a quarter of a pound of 基础英语.Half a pound of coffee.A quarter of a pound of tea. 关于half a pound of和a quarter of a pound of coffee a quarter of pound of sugar,half pound of sugar,half怎么没有a 和o a quarter of pound of tea和a half of pound of tea两句语法都对吗? a pound of 发音 A POUND a pound a pound/pounds of apples a quarter of the students. half a pound of chicken 的意思 three quarter of a book为什么quarter没用复数 a quarter of a million Maoris,