as there was no bus,we had to walk home.中as是什么~

as there was no bus,we had to walk home.中as是什么~
as there was no bus,we had to walk home.中as是什么~

as there was no bus,we had to walk home.中as是什么~
这里的用法是表示 因为,由于的 意思,相当于 because
由于这里没有巴士,我只能走路回家!