tagged atom

例句：

1. 1.The tagging atom was found tobe a rare isotope.
   标记原子被发现是一种稀有同位素。
2. 2. The tagging atom helped scientists to trace theorigin of the virus.
   标记原子帮助科学家追踪病毒的起源。
3. 3. The tagging atomwas used to study the behavior of atomsin different environments.
   标记原子被用来研究不同环境下原子的行为。