- trace substance
- 微量物[质]；追踪物
Atmospheric Sciences (English-Chinese) dictionary. 2014.
trace substance
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trace — [ tras ] n. f. • déb. XIIe; de tracer 1 ♦ Empreinte ou suite d empreintes, de marques que laisse le passage d un être ou d un objet. « des traces de pas sur la neige conduisaient à un pavillon » (Carco). Disparaître sans laisser de traces. Perdre … Encyclopédie Universelle
tracé — trace [ tras ] n. f. • déb. XIIe; de tracer 1 ♦ Empreinte ou suite d empreintes, de marques que laisse le passage d un être ou d un objet. « des traces de pas sur la neige conduisaient à un pavillon » (Carco). Disparaître sans laisser de traces.… … Encyclopédie Universelle
SUBSTANCE — Une idée reçue particulièrement tenace occupe le devant de la scène philosophique depuis l’époque du positivisme d’Auguste Comte, c’est à dire depuis plus d’un siècle: l’idée selon laquelle la métaphysique serait morte avec Kant, à la fin du… … Encyclopédie Universelle
Trace — Trace, n. [F. trace. See {Trace}, v. t. ] 1. A mark left by anything passing; a track; a path; a course; a footprint; a vestige; as, the trace of a carriage or sled; the trace of a deer; a sinuous trace. Milton. [1913 Webster] 2. (Chem. & Min.) A … The Collaborative International Dictionary of English
trace element — trace elements 1) N COUNT A trace element is a chemical element such as iron or zinc that occurs in very small amounts in living things and is necessary for normal growth and development. 2) N COUNT A trace element is a very small amount of a… … English dictionary
trace element — trace′ el ement n. 1) biochem. any chemical element that is required in minute quantities for physiological functioning 2) mir a substance that occurs naturally only in minute amounts in the earth s crust Also called trace′ min eral. Etymology:… … From formal English to slang
trace */*/ — I UK [treɪs] / US verb [transitive] Word forms trace : present tense I/you/we/they trace he/she/it traces present participle tracing past tense traced past participle traced 1) a) to find someone or something that you are looking for by asking… … English dictionary
trace — trace1 [treıs] v [T] ▬▬▬▬▬▬▬ 1¦(find somebody/something)¦ 2¦(origins)¦ 3¦(history/development)¦ 4¦(copy)¦ 5¦(with your finger)¦ 6 trace a call ▬▬▬▬▬▬▬ [Date: 1200 1300; : Old French; Origin: tracier, from Vulgar Latin tractiare to pull , from … Dictionary of contemporary English
trace — trace1 [ treıs ] verb transitive ** 1. ) to find someone or something that you are looking for by asking questions and getting information: Detectives have so far failed to trace the missing woman. trace someone to something: They finally traced… … Usage of the words and phrases in modern English
trace — 1 verb (T) 1 FIND SB/STH to find someone or something that has disappeared by searching for them carefully: She had given up all hope of tracing her missing daughter. 2 ORIGINS to find the origins of something, or where something came from: trace … Longman dictionary of contemporary English
trace element — A chemical found in very small amounts in a given substance. Organisms need certain trace elements to survive … English dictionary of cancer terms
