小题1:expanded, twice as big
小题2:equal to, without causing
小题3:On average, deaths, injuries
小题4:reason why, is that
小题5:makes it possible, to
小题1:expanded, twice as big
小题2:equal to, without causing
小题3:On average, deaths, injuries
小题4:reason why, is that
小题5:makes it possible, to