| 单词 | tracer |
| 释义 | tracer /tray"seuhr/, n. 1. a person or thing that traces. 2. a person whose business or work is the tracing of missing property, parcels, persons, etc. 3. an inquiry sent from point to point to trace a missing shipment, parcel, or the like, as in a transportation system. 4. any of various devices for tracing drawings, plans, etc. 5. Also called tracer ammunition. ammunition containing a chemical substance that causes a projectile to trail smoke or fire so as to make its path visible and indicate a target to other firers, esp. at night. 6. the chemical substance contained in such ammunition. 7. a substance, esp. a radioactive one, traced through a biological, chemical, or physical system in order to study the system. [1535-45; TRACE1 + -ER1] |
| 随便看 |
|
英语词典包含168451条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。