inert ingredient

例句：

1. 1. The inert substance was left to decay naturally.
   这个无反应的物质自然地腐烂了。
2. 2. The inert gases were released into the atmosphere.
   这些惰性气体被释放到大气中。
3. 3. The inert material is difficult to recycle.
   这种惰性材料难以回收利用。