例句：
One has to ask oneself what the purpose of the exercise is.
大家必須問一問自己，這個鍛煉的目的是什么。
It is difficult to make oneself concentrate for long periods.
讓自己長時間聚精會神是很困難的。
She forced herself to keep going.
她強迫自己堅持下去。
She runs the business by herself.
她自己經營這項生意。
She flung herself into her career.
她投身于自己的事業(yè)中。