thallous

例句：

1. 1. The Earth's mantle is where most of the planet's heat and pressure are generated.
   地球的地幔是产生行星大部分热量和压力的地方。
2. 2. The mantle beneath the ocean floor is a hot, molten rock that can cause earthquakes.
   海洋底部下方的地幔是热的、熔融的岩石，可以引起地震。
3. 3. The study of mantle materials is important for understanding the Earth's internal structure.
   研究地幔材料对理解地球内部结构非常重要。