methylphenanthrene

例句：

1. 1. The car was found to have been contaminated with methylphenanthrene, which is a toxic substance.
   汽车被发现被二甲基苯并芘污染，这是一种有毒物质。
2. 2. This plant produces methylphenanthrene, which is used as a pesticide.
   这种植物产生二甲基苯并芘，用作农药。
3. 3. Due to the high levels of methylphenanthrene in the soil, it is essential to control its spread.
   由于土壤中二甲基苯并芘含量高，控制其传播至关重要。