She learned to draw by tracing pictures out of old storybooks.她通过描摹旧故事书上的图画学会了画画。The public is urgently requested to assist police in tracing this man.紧急要求公众帮助警方追踪此人。She is tracing laboriously now.她正在费力地写....
The research effort has focused on tracing the effects of growing levels of five compounds...研究重点追踪了5种化合物含量上升的影响。The public is urgently requested to assist police in tracing this man.紧急要求公众帮助警方追踪此人。curve tracing曲线描迹法, 曲线...