bi-direction的用法和樣例：
例句
- Gate valves serve as efficient stop valves with flow in either direction.
閘閥可作為流體雙向有效的關(guān)閉閥。 - At present, asymmetrical AC and pulse with two polarities mode power supply is an important developing direction of the technology.
目前，采用不對稱(chēng)的交流或雙向不對稱(chēng)脈沖工作模式的電源是微弧氧化技術(shù)的重要發(fā)展方向。
