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.
士兵们使用曳光弹来标记他们的目标。
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.
医生注射了一种示踪剂来研究患者心脏中的血流。
translation
曳光弹, 示踪剂
词形变化
Plural
tracers