legal gas

例句：

1. 1. The new law prohibits the use of illegal gas in public areas.
   新法律禁止在公共区域使用非法气体。
2. 2.The chemical company was fined for producing a legal gas that caused harm to the environment.
   这家化学公司因生产一种对环境造成危害的合法气体而被罚款。
3. 3.The government has introduced strict regulations to control the production and sale of legal gases.
   政府已引入严格的规定，以控制合法气体的生产与销售。