two-way push-down automaton

例句：

1. 1. The two-way push-down automatonis used to control the flow of materialsin a manufacturing process.
   双向推下自动机用于控制生产过程中物料的流动。
2. 2. The two-way push-down automatonwas designed to improve efficiency and reduce errorsin data entry.
   双向推下自动机被设计用来提高效率和减少数据输入中的错误。
3. 3. The two-way push-down automaton has proven to bean effective tool for monitoring and controlling industrialprocesses.
   双向推下自动机已被证明是监控和控制工业过程的有效工具。