Regulations such as minimum operating age, restricted operating areas and compulsory classes in water safety are essential.
诸如最低操作年龄、限制操作区域和水上安全必修课等规定是必不可少的。
Regulations such as minimum operating age, restricted operating areas and compulsory classes in water safety are essential.
诸如最低操作年龄、限制操作区域和水上安全必修课等规定是必不可少的。
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