发布时间：2016-06-20 来源：新东方在线 发布人：zolo
托福考试阅读：A Pain in Third Class
It seems the more (1)cramped(狭窄的，拥挤的) your airplane seat is, the longer the flight always takes. Some folks handle this situation by just sitting tight(绷紧的) for the entire duration(持续，期间), dreaming of the hour when the plane finally lands and they get to stretch.
That may be adding danger to discomfort, studies have found. The discomfort part you already know about. The danger is that when your body is left in a cramped position for too long, blood clots(血块) can form in your feet and legs. That’s dangerous, because a blood clot that (2)dislodges(移动，逐出) will travel in the blood stream. And that’s nothing to play around with. If it reaches your lungs, it could even kill you!
Now, of course not every hurting leg is indication of a blood clot. For the most part it’s just cramped(抽筋的) muscle. But research conducted at Tripler Army Medical Center in Honolulu showed that a surprising one out of four patients in a study group being treated for blood clots in the lower legs had been on airplanes within the past month. And a (3)whopping(巨大的) eighty-two percent still had symptoms(症候，症状) two weeks after their flight!
The problem is that sitting for four hours or more reduces blood (4)circulation(循环) in the legs, especially if you are cramped up. So, to keep the old juices flowing, and to help lower the chance of blood clots forming during a long flight, get up and walk a little in the aisle(通道，走廊).
Our accommodation is rather cramped. 我们住的地方很挤。
The doctor dislodged the fish bone from her throat.
We observed the circulation of blood in frogs.
Many forged notes are in circulation.
This paper has a circulation of more than a million.