?各级
各国 each country, every country, various countries 各级 all levels 各尽所能 each does his utmost (idiom), from each according to his means ..
所有级别
层层审批
各级的反馈 ; 各级反馈
英汉双解词典包含3185865条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。