original: about 2,000 to 3,000 cocoons are required to make a pound of silk .
simplifications: about 2,000 to 3,000 cocoons are required to make a pound of silk . about 2,000 to 3,000 cocoons are need to make a pound of silk . about 2,000 to 3,000 cocoons are required to make a pound of silk . about 2,000 to 3,000 cocoons are needed to make a pound of silk . between 2,000 and 3,000 cocoons are needed to make one pound of silk . around 2,000 to 3,000 cocoons are needed to make a pound of silk . about 2,000 to 3,000 cocoons are required to make a pound of silk . a pound of silk is made of from 2,000 to 3,000 cocoons .