syntax tree的用法和樣例：
例句
- This paper introduced a kind of variable type collecting method, which is based on layered thoughtway and abstract syntax tree.
摘要提出了一種基於分層思想的，並且無需構造具體語法樹的變數類型提取方法。 - In order to cooperate with the popular bytecode, we propose a bridge mechanism to interconnect the interpretations of both bytecode and the syntax tree.
為配合目前被廣泛使用的位元組碼，我們還提出語法樹與位元組碼之間的銜接機制，讓這兩種不同的直譯機制可以互相呼叫。
