There was no trace of anyone having entered the room since then.
没有任何迹象表明在那以后有人进过这房间。
Officers were unable to find any trace of drugs.
警察未能找到毒品的蛛丝马迹。
vi. [审计]追溯;沿路走
go back、
carry up
n. [法]痕迹,踪迹;[气象]微量;[仪]迹线;缰绳
suggestion、
mark、
tail、
drop