1·Clouds of toxic gas and frequent tremors were two of the challenges faced by Tedesco, Sims, and the research team as they studied Nyiragongo's crater.
当特德斯科、西姆斯和研究团队在尼拉贡戈火山口中开展研究时，毒气云雾和频繁的震动是他们所要面临的两大挑战。
2·A serious toxic gas leakage happened in this chemical plant, and Tim's family suffered from the severe pollution because they were the most near.
化工厂发生了严重的毒气泄漏事故，距离化工厂最近的蒂姆家受到了严重的污染。
3·The Duo-Tox sensor is actually two toxic gas sensors installed in a single sensor housing.
Duo-Tox实际上是安在一个探头插座上的两个毒气探头。