The treatment should be repeated every two to three hours.

　　這種治療方法應該每隔兩到三小時(shí)重復一次。

　　He repeated none of the errors he'd made first time round.

　　他沒(méi)有重復過(guò)首次所犯下的任何錯誤。

　　Repeat these five steps, as in the last exercise.

　　照前面的練習一樣，重復這五個(gè)步驟。