as／so long as
1．if； provided that只要
As long as we unite and help each other， no one can conquer us．只要我们团结互助，谁也不能征服我们。
You shall never enter this house as long as I live in it．只要我还住在这里，就决不允许你进屋。
2．since；because；considering that 既然；因为；由于
As long as you are going to town anyway， you can do something for me．既然你一定要进城，你就可以帮我办点事。
As long as we've driven this far，we might as well go on．既然我们已经驶得这么远了，就不妨继续往前驶。