一梦两三年匆匆又夏天
[yī mèng liăng sān nián cōng cōng yòu xià tiān]
'Dreams for Two or Three Years, Hurrying to Summer Again' expresses a nostalgic feeling. This kind of online name is often used by someone who looks back on his/her sweet youth memories which might be associated with summer times that passed by too quickly, symbolizing the fleeting nature of life.