他们给早期人类提供了一种杀死敌人的有效武器。
They gave early man an effective weapon to kill his enemies.
另一个原因是房屋是一个反贫困的有效武器。
Another reason is that houses can be such effective anti-poverty tools.
人类确有一件有效武器，那就是笑。- - -马克。吐温。
The human race has one really effective weapon, and that is laughter. — Mark Twain.
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