滑雪板用防护头盔的标准规范的英文

standard specifications for helmets used in skateboarding and trick roller skating

• 滑雪板:    skis
• 用:    40分钟跑完全程 run the c ...
• 防护:    protect; shelter; ...
• 头盔:    casque; helmet; cr ...
• 的:    4次方是 The fourth po ...
• 范:    pattern; mould; ma ...