网站首页 汉语 德语 英语
A pricing system in which customers or passengers using a utility or service at a time of peak load are charged more than those using it off-peak.
1950s; earliest use found in Quarterly Journal of Economics.
礼仪网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。