There were low, muffled voices rising from the hallway.从走廊里隐约传来了低沉的说话声。I heard the voices, but couldn't make out what they were saying.我听到有声音，却听不清他们在说些什么。There was a sound of loud voices from the kitchen.厨房传来一阵喧闹声。...
此书对营养学有很大贡献。This book makes a significant contribution to dietetics.人们普遍认为他是营养学方面的著名权威.He was widely regarded as a leading authority on nutrition.我们需要振兴人类营养学研究.We need to revitalize human nutritional research....
这个参照体可大可小, 可以是容他性的也可以是排他性的; 可以是正式的、或非正式的.The group can be large, small, inclusive , exclusive, formal or informal.排他性的交易和搭卖安排对分配过程中的竞争造成遏制作用.Exclusive dealing and trying arrangements hamper competition in the distributio...