表示全角空格，
<string name="aaa">你好      啊</string>
1.Even if you use string formatting sometimes you still need whitespaces at the beginning or the end. On these cases neither escaping with nor xml:space attribute helpes. You must use xml encoding  for whitespaces.
2.I found a solution on this issue report : http://code.google.com/p/android-apktool/issues/detail?id=14
This is the same idea that Duessi suggests. Insert u0020 directly in the XML for a blank you would like to preserve.
Example :
<string name="your_id">Score :u0020</string>The replacement is done at build time, therefore it will not affect the performance of your game.