a period of sustained economic developmenta sustained attack on the government

miss a period of A period of five over a period of time period of 英语翻译 over a period of time 是a period of time 还是times? Why silent for a period of time you owe me a period of time Agreement for a period of six months! a seemingly endless period of time? what's the difference between'over a period of time'and 'during a period of time'? 关于periods of 和 a period of的英语问题periods of 和 a period of的意思是什么?例如periods of time he a period of time over a period of a few minutes是什么意思 Some people,we spent a very short period of time for a long period of time可以用什么替换? stonehenge was built slowly over a long period of a period of short time =什么单词 Sometimes really miss a certain period of time....