Sometimes, just as he had got into his stride and was thinking of putong on a bit of speed, his bowels would seem to twist and he would slow down. He might be forced to stop abruptly with his head down, to bear the pain in his stomach as best he could.

• 有时候腿脚正好开了，想试着步儿加点速度，肚子里绳绞似的一拧，他缓了步，甚至于忽然收住脚，低着头，缩着肚子，强忍一会儿。