as翻译成因为时引导什么从句

例句：

As the weather is so bad, we have to delay our journey.

因为天气太糟糕，我们不得不推迟旅行。

Any new source of energy will be very welcome, as there is already a shortage of petroleum.

任何新型能源都将大受欢迎，因为石油已经出现短缺。

As luck would have it, the train was late.

不巧火车晚点了。