I should like to enroll all my children in the swimming class.我愿意让我的孩子们都参加游泳班.I must enroll the children for piano lessons before next week.我必须在本周内给孩子们报名学钢琴课.They enroll him as a member of the club.他们吸收他为俱乐部会员....
Animals are able to hear high-pitched sounds that are inaudible to humans.动物可以听到人类所听不到的高频声音。His weak voice was almost inaudible.他的声音微弱，几乎听不见。She whimpered something inaudible.她呜咽着说了些什么，听不清。...