caesium atomic beam

例句：

1. 1.The atomic beam was used to analyze the structure of the material.
   原子束被用来分析材料的结构。
2. 2. This is a rare element that has been found in only a few places on Earth.
   这是一种稀有元素，仅在地球上的少数地方被发现。
3. 3. The scientist used a caesium beam to study the properties of the new material.
   科学家使用铯束来研究新材料的性质。