a piece of既可以加可数名词，也可以加不可数名词。例如： a piece of paper，一张纸，纸是不可数的；a piece of cigarette，two pieces of cigarettes，是可数名词。a piece of是量词，意思是一组，一对。当要对不可数名词进行计数时，一般要用这类词，充当定语的作用，修饰后面的名词。这类词要...
跟不可数：a piece of paper(一张纸),a piece of meat（一块肉）如果可数就直接用a/an + 可数名词了：a book(一本书),a desk（一张桌子）
跟不可数：a piece of paper(一张纸),a piece of meat（一块肉）如果可数就直接用a/an + 可数名词了：a book(一本书),a desk（一张桌子）
n. 块；件；篇；硬币 vt. 修补；接合；凑合 例：When I produced this piece of work, my lecturers were very critical.当我创作这件作品的时候，我的老师们批评甚多。例：Each piece is unique, an exquisite painting of a real person, done on ivory.每件艺术品都很独特，均为绘在象牙上...
n. 块；件；篇；硬币 vt. 修补；接合；凑合 例：When I produced this piece of work, my lecturers were very critical.当我创作这件作品的时候，我的老师们批评甚多。例：Each piece is unique, an exquisite painting of a real person, done on ivory.每件艺术品都很独特，均为绘在象牙上...
名词单数。一般也只能是单数，因为它一般修饰不可数名词的。1.a piece of information 信儿 2.a piece of thread 一条线 3.a piece of excrement 一块排泄物 4.a piece of land 一块地 5.a piece of china 一件瓷器
n. 块；件；篇；硬币 vt. 修补；接合；凑合 例：When I produced this piece of work, my lecturers were very critical.当我创作这件作品的时候，我的老师们批评甚多。例：Each piece is unique, an exquisite painting of a real person, done on ivory.每件艺术品都很独特，均为绘在象牙上...
a piece of 一块（片）a kind of 一种 a tuft of (hair,feathers,grass,etc.)a skein of (yarn,thread,etc.)a hank of (wool,silk,etc.)a bob of (silk,hair,etc.)a bowl of 一碗 a glass of a cup of a lot of a type of a number of ...
a piece of 后可数名词的单数形式 或者 不可数名词 例如：a piece of cake 一块蛋糕 a piece of cloth 一块布