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能在足球场或板球场上相遇就会没有兴趣在战场上相遇的话，我都倍感诧异。 the question of prestige arises, as soon as you feel that you and some larger unit will be disgrace你所属团体会有失体面时，你最野蛮的好斗本能就会被激发出来。 he echoes, they can locate and steer clear of obstacles------or locate flying insects on which they 者找到它们赖以为生的昆虫。蝙蝠这种回响定位法常拿来和原理与之很相近似的雷达相比。 hundred dollars, engineers may soon be free to let their imaginations soar without being penalized 任他们的想象驰骋而不会被昂贵的失败所惩罚。