无家可归: homeless...
由: to follow, from, because of, due to, by, via, through, (before a noun and a verb) it is for... to......
看不起: to look down upon, to despise...
荧光: fluorescence, fluorescent...
不经意: not paying attention, carelessly, by accident...
读: to read, to study, reading of word (i.e. pronunciation), similar to 读书 read book...
