tracing
v. 找到；追溯；追踪；沿……走；描绘；画（线）；勾画出（轮廓）；描摹；研究……的历史（trace 的现在分词）
n. 摹图；淡淡的痕迹；冰上划痕；痕迹；追踪时留下的复制档案
例句
She learned to draw by tracing pictures out of old storybooks.
她通过描摹旧故事书上的图画来学绘画。
《柯林斯英汉双解大词典》
The public is urgently requested to assist police in tracing this man.
公众被紧急要求协助警方追踪这名男子。
The research effort has focused on tracing the effects of growing levels of five compounds.
研究集中跟踪5种化合物水平上升带来的影响。
