positional是什么意思？

positional

例句

• It reacts action to protect affuse valve, to ensure affuse and capper positional veracity. 该装置应用于灌装机上,对保护灌装阀和保证灌装位置的准确性起到积极的作用.
• Benign paroxysmal positional vertigo ( BPP ) is the most frequent vestibular disorder. 良性阵 发性 体位性眩晕是最常见的前庭病症.