慢速英语:Science Fiction: ‘A Princess of Mars’ by Edgar Rice Burroughs

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例句：Their hostile looks showed that he was unwelcome.
      他们怀敌意的表情说明他不受欢迎。

2.trail n.足迹; 臭迹

例句：The hound found the trail of the rabbit.
      猎狗发现了兔子的踪迹。

小径;（乡间的）小路

例句：The men had followed desert trails for days.
      那些人沿着沙漠小道走了数日。

3.capture vt.俘获; 俘虏; 捕获

例句：We captured the criminal.
      我们捕获了那个犯人。

4.frighten vt.vi.(使)惊恐;使惊吓

例句：You'll find that I don't frighten easily.
      你会发现我不是轻易就会害怕的。

5.gravity n.万有引力; 地心引力; 重力

例句：An apple falls down because of gravity.
      由于重力的关系, 苹果往下掉。