单词：tracings
[医]描记
n. the act of drawing a plan or diagram or outline
n. a drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image
n. the discovery and description of the course of development of something
n. a drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image
n. the discovery and description of the course of development of something