请问下这个问题要怎么答?用英文,

Laspeyres
Advantages Requires quantity data from only the base period.This allows a more meaningful comparison over time.The changes in the index can be attributed to changes in the price.
Disadvantages Does not reflect changes in buying patterns over time.Also,it may overweight goods whose prices increase.
Paasche
Advantages Because it uses quantities from the current period,it reflects current buying habits.
Disadvantages It requires quantity data for the current year.Because different quantities are used each year,it is impossible to attribute changes in the index to changes in price alone.It tends to overweight the goods whose prices have declined.It requires the prices to be recomputed each year.