the fact of a person suffering from deep vein thrombosis after they have travelled on a plane. This condition is thought to be more common among people who travel in the cheapest seats because they do not have space to move their legs much. 经济舱综合征， 经济舱症候群 （乘坐飞机导致深静脉血栓形成，被认为在经济舱乘客中更常见）