Carbon dioxide is removed from the atmosphere by a number of processes that operate on different time scales.二氧化碳经过一系列的过程从大气层中被除去，这些过程所需要的时间段各有不同。Some of the mummy's wrappings had been removed.木乃伊的部分裹尸布已经被除去。The plaster on the walls has been removed to expose the original bricks underneath.墙上的灰泥已被除去，露出了里面原本的墙砖。