tracer
🇺🇸
/ˈtreɪsər/
🇬🇧
/ˈtreɪsə(r)/
noun
R
A bullet or shell that leaves a visible trail behind it, often used for aiming.
The soldiers used tracer bullets to mark their targets.
士兵們使用曳光彈來標記他們的目標。
R
A radioactive substance used to track the path or function of something inside the body.
The doctor injected a tracer to study the blood flow in the patient's heart.
醫生注射了一種示踪劑來研究病患心臟中的血流。
translation
曳光彈, 示蹤劑
詞形變化
Plural
tracers