1. The damage to skill and craftsmanship—that's needed to build a complex airliner or a tractor, or for a worker to move up from assembler to machinist to supervisor—went largely unnoticed. 对技术和工艺的损害——制造一架复杂的飞机或拖拉机，或工人从装配工到机械师再到监督员所需要的技术和工艺——在很大程度上被忽视了。
2. His departure passed unnoticed. 他神不知、鬼不觉地离开了。
3. I tried to slip up the stairs unnoticed. 我试图神不知鬼不觉地溜上楼梯。
4. His kindness did not go unnoticed by his staff. 他的厚道员工了然于心。
5. A phantom trading scheme at a Wall Street investment bank went unnoticed for three years. 一家华尔街投资银行的虚构的交易方案历经3年都未被察觉。
