A pair of oxen were drawing a heavily loaded wagon along the highway, and, as they tugged（用力拉） and strained at（紧拖） the yoke, the axletrees（轮轴） creaked and groaned 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.