☻PX对二甲苯(para-xylene);☻有毒的noxious/toxic;☻化学物质chemical;☻示威者demonstrator;☻抗议者protestor;☻防暴警察riot police;☻混战scuffle;☻冲突clash;☻横幅banners;☻搬迁relocate;☻关闭shut down
