旋转水冷保护筒
Rotary Water-cooled Sleeve for Protecting Converter Mouth
材料保护保养
material protection and maintain
（差动保护）
Better-than-average effect
自然保护模式
the model of natural protection
《香港政府和日本政府关于相互促进和保护投资协
Promotion and Protection of Investment
《香港政府和日本政府关于相互促进和保护投资协议》
the Promotion and Protection of Investment
Agreement between the Government of Hong Kong and the Government of Japan for the Promotion and Protection of Investment
……国际自然及自然资源保护联盟
International Union for the Conservation of Nature
100%定子接地保护
100% stator earth fault protection