noun🔗Share示踪剂，追踪剂。 A compound, element, or isotope used to track the progress or history of a natural process."Scientists used a radioactive tracer to track the movement of water through the soil. "科学家们使用了一种放射性示踪剂来追踪水分在土壤中的移动。compoundelementchemistrybiologybiochemistrymedicinescienceprocessChat with AIVocabulary GamePractice Reading
noun🔗Share曳光弹，示踪弹。 A round of ammunition for a firearm that contains magnesium or another flammable substance arranged such that it will burn and produce a visible trail when fired in the dark."The hunter used a tracer round to mark his target in the dark forest. "猎人在漆黑的森林里用一颗曳光弹来标记他的目标。militaryweaponmaterialChat with AIVocabulary GamePractice Reading
noun🔗Share追踪，追查 The act or state of tracking or investigating something."The police investigation is a tracer of the thief's movements. "警方的调查是对小偷行动轨迹的追踪和追查。actionprocessChat with AIVocabulary GamePractice Reading
noun🔗Share追踪请求，追查要求 A request to trace the movements of a person or an object, such as a shipment."The shipping company issued a tracer for the lost package. "这家航运公司发起了对丢失包裹的追踪请求。communicationbusinessservicetechnologyindustryChat with AIVocabulary GamePractice Reading
noun🔗Share追踪者，搜寻者 A person who traces something."The art student became a skilled tracer, able to perfectly copy the intricate lines of the master drawing. "这位美术生成为了一位技艺精湛的临摹者，能够完美地复制大师作品中错综复杂的线条。personjobChat with AIVocabulary GamePractice Reading
noun🔗Share示踪器，描图器 A device or instrument used to assist in making tracings."The art student used a special tracer to copy the intricate design onto her canvas. "这位美术生使用了一种特殊的描图器，将复杂的图案复制到了画布上。devicetechnologymachineChat with AIVocabulary GamePractice Reading
