From the fluidity of time and space, we get to know that Willy Loman used to be a successful ______ when he was young.
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从历史上看,战争或者存在战争的威胁对飞机技术的发展有促进作用。
Setting and passage of time of the ______ play is unclear whereas those of the traditional plays are always clearly presented to the audience.
后退襟翼使用时,既加大了翼型弯度,又增大了机翼面积,从而增大升力。