There were gangs of kids on motorbikes roaming around.过去有成群结队的年轻人骑着摩托车四处游荡。Cars and motorbikes had churned up the field.汽车和摩托车在地上留下了一道道车辙."They're slow, heavy and cost a fortune."— 'So how have these motorbikes...
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....