1·She told me that behind the unmarked door were the animals that were scheduled for euthanasia that day.
她告诉我，那扇没有标记的门后面，是当天被安排实施安乐死的动物。
2·In experiments where people were given Coke and Pepsi in unmarked cups and then hooked up to a brain scanner, the device clearly showed a certain number of them preferred Pepsi while tasting it.
在那些人在没有标记的杯子给可口可乐和百事可乐，然后挂接到大脑扫描实验，该装置清楚地表明了他们一定数目的首选，而百事可乐品尝它。
3·At one point he handed the assembled notables unmarked brown envelopes.
在这时他发给聚集的名流们一个棕色没有标记的信封。
1·Her shoes are still white and unmarked.
她的鞋子仍是白色、无记号的。
—— 《柯林斯英汉双解大词典》