Tourists are sometimes disappointed when visiting historic buildings or landmark like Big Ben in London, to find it covered by a cage of scaffolding and polythene sheeting.

• 当旅游者参观历史建筑物或纪念碑，比如伦敦大笨钟，而却看见它被脚手架笼子或聚乙烯网子罩住时，会大失所望。