| 单词 | trace |
| 释义 | trace 1. v. & n. --vtr. 1. a observe, discover, or find vestiges or signs of by investigation. b (often foll. by along, through, to, etc.) follow or mark the track or position of (traced their footprints in the mud; traced the outlines of a wall). c (often foll. by back) follow to its origins (can trace my family to the 12th century; the report has been traced back to you). 2. (often foll. by over) copy (a drawing etc.) by drawing over its lines on a superimposed piece of translucent paper, or by using carbon paper. 3. (often foll. by out) mark out, delineate, sketch, or write esp. laboriously (traced out a plan of the district; traced out his vision of the future). 4. pursue one's way along (a path etc.). --n 1. a a sign or mark or other indication of something having existed; a vestige (no trace remains of the castle; has the traces of a vanished beauty). b a very small quantity. c an amount of rainfall etc. too small to be measured. 2. a track or footprint left by a person or animal. 3. a track left by the moving pen of an instrument etc. 4. a line on the screen of a cathode-ray tube showing the path of a moving spot. 5. a curve's projection on or intersection with a plane etc. 6. a change in the brain caused by learning processes. Phrases and idioms trace element 1. a chemical element occurring in minute amounts. 2. a chemical element required only in minute amounts by living organisms for normal growth. trace fossil a fossil that represents a burrow, footprint, etc., of an organism. Derivatives traceable adj. traceability n. traceless adj. Etymology: ME f. OF trace (n.), tracier (v.) f. L tractus drawing: see TRACT(1) 2. n. each of the two side-straps, chains, or ropes by which a horse draws a vehicle. Phrases and idioms kick over the traces become insubordinate or reckless. trace-horse a horse that draws in traces or by a single trace, esp. one hitched on to help uphill etc. Etymology: ME f. OF trais, pl. of TRAIT |
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