a或a piece of
如:
a diary 一本日记
one page of a diary; a page of the diary 日记的一页/一篇日记
常用的单位量词:
a piece of diary一则日记;a sheet of paper 一张纸;a suit
of clothes一套服装;an article of clothing一件衣服;a crowd
of people一群人;a basin of water 一盆水;a block of wood一块木头;a cake of soap 一块肥皂;a bottle of ink一瓶墨水;a grain of sand 一粒沙子;a group of tall trees 一片高树;a team of players一队运动员;a copy of China Youth 一分《中国青年》;a drop of oil 一滴油;a loaf of bread一块面包;a pack of cigarettes一包烟;a pair of socks一双短袜;a tin of beer一罐啤酒;a set of equipment一套设备;a bucket of water一桶水;a couple of eggs两个鸡蛋;a pile of old books 一堆旧书;a bowl of rice 一碗米饭;a handful of sand一把(少量的)沙
如:
①Piles of old books were sold when we moved.
②Three pieces of important news were printed in the front page.