"R" in spanish is very difficult to pronounce for Chinese. The native spanish speakers always making fun of Chinese about that. It is better to get some audio media, listen and practice. BBC learning foreign language is very helpful, it is free. I have a link to BBC at http://arcoplaza.com, you will find the BBC learning foreign language under e-learning section.

你是想练RR多击的么? 单击的R跟L的发音有些类似 就是舌头尽量不要碰到上颚 然后多练些 TR DR 开头的单词 平时没事就抖抖舌头、、、躺着容易发出来 恩 大概一个月 左右能会 某天你会突然发现就发出来了~~ 不用太在意这个 因为在西班牙也有很多人天生发不了这个音的 加油！ANIMATE~

Hola Fiona, I am not sure you speak English?Seems from your profile that you do. It is just like the English "R" in 'rain , run , read'.