Aircraft production continued to plod along at an agonizingly slow pace.飞机制造业仍旧举步维艰，发展速度之缓很让人头疼。He was destined to plod the path of toil.他注定要在艰辛的道路上跋涉.They had to plod wearily on up the hill.他们不得不迈着疲倦的步子登上山....
Cholelithiasis may be associated with present or past episodes of either acute or chronic cholecystitis.胆石症可能与现在和过去的急性或慢性的胆囊炎发作有关.Aim To explore the clinical characters of senile cholelithiasis and cholecystitis.目的探讨老年型胆...