祖国: motherland...
发票: invoice, receipt or bill for purchase...
背叛: to betray...
歧视: to discriminate against, discrimination...
骚乱: disturbance, riot, to create a disturbance...
调研: to investigate and research, research, investigation...
心得: what one has learned (through experience, reading etc), knowledge, insight, understanding, tips...
木材: wood...
汇聚: convergence, to come together...
城堡: castle, rook (chess piece)...
