look it up阅读篇章结构

英语的篇章（Discourse)，包括口头形式和书面形式，通常是由句子和语段(SentenceGroup）构成的，即所谓“积句而成章，积章而成篇”。

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• Da Vinci,Leonardo
  • painter
    • from an early age
      • showed great Intelligence and artistic ability
        • Mona Lisa
          • famous
  • inventor
    • had many inventions
      • some drawing of flying machines.
  • musician
  • engineer
  • scientist
• Dinosaurs
  • when
    • more than 16 million years before human beings
  • where
    • everywhere
  • what
    • as small as chickens as big as ten elephants could even fly
  • eating
    • plants or meat
  • how long
    • more than 150 million years
  • why
    • nobody knows
  • how
    • from their fossils