C2 used to talk about the reasons for a particular situation, especially a bad or difficult situatio

中文解释

（尤指糟糕或困难的局面）因为，由于 I\'m very tired, what with travelling all day yesterday and having a disturbed night. 我非常累，因为昨天旅行了一整天，而且晚上又被吵得没睡好。