钍

例句：

1. 1. The atomic bomb was made from the element thorium.
   原子弹是由元素钍制成的。
2. 2. Thorium is a rare earth metal that is used in nuclear reactors.
   钍是一种稀有的稀土金属，用于核反应堆中。
3. 3. Thorium can be found in nature, but it is not as common as other elements like uranium.
   钍可以在自然界中找到，但它不像铀那样常见。