as long as = mientras
There is no problem with the weather as long as the temperature is above zero.
No hay ningún problema con el tiempo, mientras la temperatura esté encima de cero.
As long as there is love in this world, people will have a chance for a better future.
Mientras haya amor en el mundo, la gente puede esperar que las cosas se mejoren.
They were happily married as long as they were young.
Cuando eran jovenes, su matrimonio era feliz.