so long as
1
只要, 在...期间
used to describe a duration or period of time during which something happens or continues to be true
- He promised to help so long as he was available.
他承诺会帮忙，只要他有空。
- I'll be happy so long as you're with me.
只要你和我在一起，我就会很开心。
- She remained calm so long as the situation was under control.
只要情况在控制之中，她就保持冷静。
2
只要, 条件是
used to introduce a condition that must be satisfied for another action or state to occur
- They agreed to stay so long as the weather permitted.
他们同意留下来，只要天气允许。
- He assured me that the car would run smoothly so long as it was maintained properly.
他向我保证，只要保养得当，车子就会运行顺畅。