题目

Dolphin （海豚） or not a dolphin? That is the question! You see, there are several types of dolphins. Some are saltwater dolphins while others are river dolphins.What are the 32 types of dolphins? When people are asking the question, they are actually referring to the saltwater dolphins in oceans and seas. The river dolphins living in fresh water, are not included in these species （ 物种）. But what would be the answer in this case if we ask,Dolphin or not a dolphin? The answer would obviously be yes. River dolphins still belong to the dolphin family.Among the 32 types of dolphins, s已知双曲线x2a2-y2b2=1的离心率为2，它的一个焦点与抛物线y2=8x的焦点相同，那么双曲线的焦点坐标为______；渐近线方程为______．