thorium series

例句：

1. 1. The new thorium series has been launched in the market.
   新推出的钍系列已经在市场上推出。
2. 2.The thorium series is widely used in nuclear power plants.
   钍系列在核电站中被广泛使用。
3. 3.The thorium series has a high energy density and can be used as an efficient fuel for nuclear reactors.
   钍系列具有高能量密度，可以作为核反应堆的有效燃料。