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1·The historical evolution of rites and music is showed the changes of the sacrificial vessel exteriorly, which contains abundant connotation of the norm of etiquette.

礼乐制度的历史变革外在体现为礼器的变化。礼器体制的沿革蕴含着丰富的礼制内涵。

2·Free resource for instance: free mailbox, free website is landed, release information freely, can promote free service of sacrificial vessel distinctive that is better.

免费资源比如：免费邮箱、免费网站登陆、免费发布信息、能提供具有特色的免费服务那就更好了。

3·Sacrificial anode; cathodic protection; small pressure vessel; application;

牺牲阳极； 阴极护卫； 小型压力容器； 应用；