下句（见补充说明）当中as的同法应如何解释?
问题描述：
下句（见补充说明）当中as的同法应如何解释?
Acoustical engineers use reflection principles（反射定律） to design concert halls so that the sound waves from the stage are not distorted as they bounce off the walls.
上句后半段中的那个as,应解释为when.还是because?
答
when 当声波从墙面反弹回来的时候~