1. announce vt. 宣布;述说
例句：But the authorities are reluctant to announce bad news.
但当局却迟迟不宣布这个坏消息。

2. poverty n.贫穷;缺乏，不足
例句：Over half the population lives below the poverty line.
超过一半的人口生活在贫困线以下。

3. experience n.经验，体验
例句：Reading classic books can boost your learning experience.
阅读经典书籍可以增加你的学习经历。

4. slavery n.奴隶身份;奴隶制度
例句：He is able to free Jim from the immediate evil of slavery.
他能够把吉姆从奴隶制度的直接祸害中拯救出来。

5. distinguish vt. 区分
例句：It is not easy to distinguish cultured pearls from genuine pearls.
辨别真珍珠和养殖珠不容易。
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