他身体某处的血栓块脱落，通过血液循环进入他的心脏，停留在他的肺部。
A blood clot from somewhere in his body had broken free and been carried through the circulation into the heart, then lodged in his lungs.
有一个故事：有一次，一对恋人乘坐一辆巴士进入山区，他们打算在某处下车他们下车后，巴士接连往前驶。
There is a story: Once upon a time, a pair of lovers entered the mountain area on a bus. They wanted to go down the bus and after they go down the bus, the bus go on to drive.
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