over the past ten 为什么over可以用在这里?

over the past ten 为什么over可以用在这里? Over the past ten years ,over这里是介词吗 over the past ten years over the past ten years是什么意思 they --all over the country in the past ten years 句中有Over the past ten years 应用什么时态? 英语翻译Increasingly,over the past ten years,people – especially over the past ten years能加过去完成时吗? over the past century over the past是什么意思 over the past year. over the past centuries