I have a younger sister . Her name is Tan Ruo Yu . She is nine years old . At home , Ruo Yu is a very talkative girl . At outdoors , she is as quiet as an owl .
However , Ruo Yu likes animals . She reads a lot of books about animals , such as elephants , rabbits , tigers , lions and penguins . In the past , she knew very little about animals . Now , she has some knowledge about the animals .
Ruo Yu likes being outdoors . She usually enjoy jogging with me at playground . Sometimes , we play on the slides . We have fun playing together .
I love my younger sister very much .