ni hao ma? wo jiao rolly, wo mei tian xue xi pu tong hua,

in pinyin characters, can you please specify or explain how this characters are built .. to come up as a word. cause i believe each characters has an explanation. like love(ai) how does it became an (Ai)?

i’ll wait.. for the best answer . i’m enjoying it here!!

wo xi huan ni!
xie xie
zai jian!!
xiao xin!