When he was through with his duties, he set up a small laboratory in an empty express car of the train he traveled on.

当他完成自己的任务后，他在自己乘坐的一节空车厢上建立了一个小实验室。

For two days and nights this express car was dragged along at the tail of shrieking locomotives; and for two days and nights Buck neither ate nor drank.

这节快车车厢被轰鸣的火车头拖着走了整整两天两夜，而巴克也两天两夜滴食未进。