To be ignorant of one's ignorance is of the ignorant.每天进步一点点----不知道自己的无知,是无知者的通病.They appear to be ignorant of what is going on here.他们对这里发生的事似乎一点也不知道.She appears to be ignorant of this fact.她似乎不知道这件事实....
只有精密的X射线仪器才能显示出来。It will only register on sophisticated X-ray equipment.这些精密仪器已经大规模投入生产.These precise instruments have already gone into mass production.精密仪器用来帮助飞行员操作飞机.Precision instruments are used to help pilots in gu...