halogen vapour

例句：

1. 1. The laboratory was filled with a halogens vapour.
   实验室充满了卤素蒸气。
2. 2. The scientist noticed the presence of a halogens vapour in the air.
   科学家注意到空气中存在卤素蒸气。
3. 3. The halogens vapour had a strong smell that made him uncomfortable.
   卤素蒸气有一股强烈的气味，让他感到不舒服。