痕迹: mark; vestige; imprint; impression; trace; trail; print 短语和例子不露痕迹 make no sign; 一种古代文明的痕迹 the vestiges of an ancient civilization. 敌军留下了仓皇退却的痕迹。 the enemy's retreat left marks of haste. 岁月
Vestigial organ an organ that is functionless and generally reduced in size but bears some resemblance to the corresponding fully functioning organs found in related organisms 痕迹器官:一些没有功能,体积缩小但与相关物种的相应功能完全的器官具有一定相似性的器官。