A pair of oxen were drawing a heavily loaded wagon1 along the highway, and, as they tugged2（用力拉） and strained at（紧拖） the yoke3, the axletrees（轮轴） creaked and groaned4 terribly. This was too much for the oxen, who turned round indignantly（愤怒地） and said, "Hullo, you there! Why do you make such a noise when we do all the work?"
They complain most who suffer least.
