1.It may be a waste of time sending children to the dentist to have fillings.
a waste of time浪费时间
Personally I think it's a waste of time.
在我看来,这是浪费时间
。2.Experts already know there is wide variation in care, which means that a young child with signs of tooth decay could have no treatment, a filling or the tooth pulled out depending on which dentist they attend.
pull out拔出
Suddenly all the men pull out pistols and begin blasting away.
突然,所有人都拔出手枪,连续射击
。