“一片”是一个很普通的数量词,其意义有实和虚之分。实是指“一片”表示具体的数量,如“饭后服一片药”;虚是指“一片”不表示具体的数量,如“祖国江山一片红”。实指“一片”中的数词“一”可以被替换,如:“买两片药”,虚指“一片”中的数词仅限于“一”,如不能说“祖国江山? “A piece of” is a very common quantitative word, its meaning is real and imaginary. Really refers to the “one” that the specific number, such as “a meal after taking medicine”; imaginary refers to “a” does not mean that the specific number, such as “motherland is a red.” Refers to the “one” in the number “one” can be replaced, such as: “buy two tablets of medicine”, refers to “one piece” in the number is limited to “one”, as can not say "motherland?