%s/[^a-zA-Z ]*//g
%s/\(\w\+\)/"\1"/g
%s/[[:space:]]\+/,/g

Given:
Croatia 克罗地亚  	Lithuania 立陶宛 	    Slovenia 斯洛文尼亚
Cyprus 塞浦路斯 	Luxembourg 卢森堡   	    Spain 塞班牙

Output:
"Croatia","Lithuania","Slovenia",
"Cyprus","Luxembourg","Spain",