It seemed to Tim that the pipe had shrunk to half its size. He was scarcely able to get through the outlet valve at all.

对于蒂姆而言，管道的长度似乎减少了一半，他勉强能够进入到出口阀里。

A little group of engineers stood on the shop floor beside the great Blower. Two men were swinging the big wheel which closed the outlet valve.

数位工程师站在吹风机旁边的生产区，两个男子挥舞着关闭排出口的巨轮。

A huge outlet valve at the beginning of the pipe had been left open. Into this he squeezed, scarcely daring to breathe for fear the hole would stop him with its sharp edges.

管道起始段有一个开着的出口阀，他挤进出口阀，不敢呼吸，生怕阀口的尖锐边缘会阻止他通行。