慢速英语:"A Princess of Mars," by Edgar Rice Burroughs, Part Two

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2. gather vt.收集; 采集; 聚集
例句：All the members of the family gather to enjoy a reunion dinner.
全家人聚在一起吃团圆饭。

3. threaten vt.危及; 恐吓
例句：It's a very cheap way to threaten an old lady like this.
这样威胁老太太太卑鄙了。

4. fierce adj.猛烈的; 凶猛的
例句：The competition right now is fierce.
现在竞争得非常厉害。

5. defend vt.保卫; 辩护
例句：We must defend our country.
我们必须保卫我们的国家。

6. believe vt.相信; 信任; 以为
例句：Whom should we believe?
我们应该相信谁呢？

7. flee vi.逃走，逃掉
例句：He was lucky to flee the burning hotel.
他很幸运逃出了失火的旅馆。

8. explosion n.爆发; 爆炸，炸裂
例句：The population explosion is accompanied by a population implosion.
人口爆炸还伴随着人口爆聚。