1.The quiz papers were unnumbered and thus appeared to be untraceable, and were thrown away at the end of the study.
试卷没有标号，看上去无法辨认是谁做的题，并在活动结束后丢弃。
2.The shipping of two printers containing the almost untraceable explosive PETN on board cargo planes bound for the United States.
两台装有难以探测的，称做PETN爆炸物的打印机装载在飞机货运仓被运往美国。
3.Unlike rare jewels, chips have had the advantage of being untraceable.
电脑芯片不像稀有的珠宝。它的优点是无法追查原主。
4.She urgently phones her contact, and he orders her to go to Munich and remain untraceable .
她急切地打电话给她的联络人，对方指令她前往慕尼黑，并保持不被他人找到。
5.And he went to his garage with other officers to retrieve an untraceable gun he would claim belonged to the victims.
他还和其他官员一起去他的车库取回一把来历不明的枪，说这把枪曾为受害者持有。
6.There may be a thousand or more of them in the Indian Ocean, unchecked and untraceable.
也许有一千艘或更多的渔船在印度洋从事非法作业，未受检查又难觅踪影。
7.Existing voting schemes mostly assume that the voting center is trustful or untraceable channels are exist between voters and voting center.
已有的大部分电子投票方案都假设投票管理机构是可信赖或者在投票人与投票管理机构之间的信道是不可追踪的。
8.Other gifts by the Kochs may be untraceable; federal tax law permits anonymous personal donations to politically active nonprofit groups.
至于科氏用于打通关节的其他手段则无迹可寻了；联邦税法允许个人匿名向非盈利政治活动组织捐款。
9.One reason documents become untraceable in a paper office is convoluted and competitive indexing systems.
纸质办公室中，文档变得不可跟踪的一个原因在于混乱的索引系统。
10.Protesters in cyberspace, by contrast, are usually anonymous and untraceable.
对比之下，网上抗议者一般是匿名的，难以追踪。