re-learning markup sections

[胡海鹏 - Hu Haipeng]

Hello,
  I am re,reading the sections in NR about markups. The following confuses me, because I can't find any wrong points in the last one. The madual says it has no anchor point, so can't be moved. Can you give me any clues?
  Also, I can't distinguish xx-align and xx-column. I think \left-align { "abc def" "ghi jkl" } will be the same when using \left-column. What's the difference? Could anyone give a plain text demo formatted with spaces?

Regards
Haipeng

-- begin quote --

The following example demonstrates these two possibilities; the last markup in this example has no anchor point, and therefore is not moved.
d2^\markup {
  Acte I
  \raise #2 { Scène 1 }
}
a'
g_\markup {
  \null
  \lower #4 \bold { Très modéré }
}
a
d,^\markup {
  \raise #4 \italic { Une forêt. }
}
a'4 a g2 a

-- end quote --

 

---

全国最低价，天天在家冲照片，24小时发货上门！