书籍经过严格编辑和校对，内容结构清晰，是网络文本难以替代的高质量语料。
Watch: Jesse Jackson's life in civil rights, diplomacy, and politics
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这些问题的答案，都越来越清晰。
"Do your homework, listen to your teacher, pay attention in class and read books, and that will give you something to focus on," she says in a matter-of-fact way.