She lives in a village on the frontier.
她住在边境的一个村庄里。

Don‘t depend on others.
Don’t depend on other people.
Don’t count on others.
Don’t rely on others.
不要依赖别人.
I usually go to school on foot.
I usually walk to school.
我通常都走路去学校。
He crept into the cave on all fours.
他爬进洞里。
on all fours: 4肢全部接触地面;
climb : 向上爬,爬山;
creep: 匍匐,四肢接触地面爬;

On : 表,接触,球不断的换接触点,表进行;
The house is on fire.
房子失火了。
On hearing the news,I burst into tears.
听到这个消息,我哭了起来。
I was surprised at the news.
我对那个消息感到惊讶。
I read a book on modern pop music.
I read a book about modern pop music.
我读了一本关于现代流行音乐的书。