This is my beautiful home. There is a small garden in front of my house. There are many beautiful flowers in the garden. Behind my house there is a big tree. Near the tree, you can see a garage. My father’s beautiful car is in it now.
   On the first floor, there is a large living room, a dining room, a kitchen and a bathroom. I like watching TV in the living room. On the second floor, there is a small study room and two bedrooms. I love playing with the computer in my study. 
   What a nice home! I like it very much.

害群之马

    黄帝将见^①大隗^②乎具茨^③之山，适遇牧马童子，问涂^④焉，曰：“若^⑤知具茨之山乎？”曰：“然^⑥。”“若知大隗之所存^⑦乎？”曰：“然。”黄帝曰：“异哉^⑧小童！非徒^⑨知具茨之山，又知大隗之所有。请问为天下^⑩”。小童辞^⑪。黄帝又问。小童曰：“夫为天下者，亦奚以异平牧马者哉^⑫？亦去其害马者而已矣。”黄帝再拜稽首^⑬，称天师而退。

（节选自《庄子·徐无鬼》）

【注】①见：拜访。②大隗：传说中的神名。③具茨：山名，在荥阳密县（今河南省密县）。④涂：同“途”，即路，⑤若：你。⑥然：是的。表应答。⑦所存：所在的地方。⑧异哉：了不起啊。异，不寻常。⑨非徒：不但，不只。⑩为天下：治理天下。⑪辞：谢绝。⑫亦奚以异乎牧马者哉：这与牧马还有什么两样吗；奚，何。以，因。异，不同。乎，于，相当于“与”、“跟”。⑬稽首：叩头。

已知椭圆的长轴长是短轴长的$\sqrt{3}$倍，则椭圆的离心率等于(   )