oneself
pron. 自己；亲自；（不受他人影响的）自己
例句
One likes to do it oneself.
人都喜欢亲自去做。
《牛津词典》
One has to ask oneself what the purpose of the exercise is.
大家必须问一问自己，这个锻炼的目的是什么。
It is difficult to make oneself concentrate for long periods.
让自己长时间聚精会神是很困难的。
