Labelled atom
[化] 标记原子; 示踪原子
🧩 词语组成解析
a. 贴上标签的
🗣️ 情景例句
Where's your father?
你爸爸在哪？
Better an empty purse than an empty head.
宁可钱袋瘪，不要脑袋空。
As Fred was going in the same direction, he walked along with the tourist.
因为游客与弗雷德走的是同一个方向，他便与游客一道同行。