例句與造句

1. Damage from " Hypera postica ", the alfalfa weevil, a serious introduced pest of forage, was substantially reduced by the introduction of natural enemies . 20 years after their introduction the population of weevils in the alfalfa area treated for alfalfa weevil in the Northeastern United States remained 75 percent down.
2. It's difficult to find hypera postica in a sentence. 用hypera postica造句挺難的