as翻譯成因為時引導什么從句

　　例句：

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

　　因為天氣太糟糕，我們不得不推遲旅行。

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

　　任何新型能源都將大受歡迎，因為石油已經出現短缺。

　　As luck would have it, the train was late.

　　不巧火車晚點了。