翻译over an extended period of time-higher doses,i.e up to 2 c

翻译over an extended period of time-higher doses,i.e up to 2 c Your session has expired due to an extended period of inacti over a period of time 英语翻译 over a period of time over a long period of time off and on、for up to、during the period、over time造句 Since receiving your letter over a long period of time to re 用...to take..(period of time)造句 over a period of five Thousands of tons of rubbish__ over a large period of time用r over the same period翻译 Ten weeks.Such a long period of time.怎么翻译?