during the past quarter-cenrury什么意思?

during the past quarter-cenrury什么意思? a quarter past two 什么意思? 英语翻译During the past quarter-century,there are lots of simila It's a quarter past six什么意思 quarter by quarter什么意思 a quarter past one 的意思 a quarter past ten的意思 a quarter past six的意思 a quarter past half 的意思 During the past three days.是个什么时间概念? during the past 50 years用于什么时态 "quarter past