已知$F_1,F_2$是椭圆$\frac{x^2}{a^2}+\frac{y^2}{b^2}=1(a>b>0)$的两个焦点，以线段$F_1$$F_2$为边作正三角形$M{F}_1{F}_2$，若边M$F_1$的中点在椭圆上，则椭圆的离心率是(   )

   I will never forget the year when I was 12.My mother told us that we would not get Christmas gifts because there was not enough money .I felt sad and thought, ”What shall I say when the other kids ask me about my gifts?” I started to hope the Christmas wouldn't come that year. Just then three women came to our house with gifts for all of us. For me，they brought a doll .I felt so happy.
   Years later, my life changed a lot. So one Christmas, I wanted to do something special. I asked forty friends to help me. We visited 125 orphans(孤儿)to come to our Christmas party. For every child, we prepared a beautiful gift.
   Finally the moment came. I called out,” One, two, three. Open your gifts!” As the children opened their boxes, the whole room was full of their bright smiles. The feeling I got from that Christmas so long ago came again.