tree coding的用法和樣例：
例句
- Pre-processing was designed to mark the significance of all nodes and main-processing to finish listless zerotree coding.
預處理完成對所有節點顯著性的標註，主處理完成無鏈表的零樹編碼。 - When coding the wavelet-trees, zerotree is using neatly, which improves the compression efficiency.
在對小波樹編碼時，靈活運用了零樹的概念，提高了壓縮效率。
