罚款之金额必须明文规定。
这种情况在包括加州在内的20个州属于例外，因为这些地区的法律明文规定，摩托车手驾驶时必须带上头盔。
Every motorcyclist has a choice to make that is except in the more than 20 states, including this state of California, that require the use of the helmet by law.
航运业已经明文规定船东和船舶经理人必须严格遵守工作和休息时间制度，但这并不能说明什么。
The shipping industry has strict regulations in place that all shipowners and ship managers must comply with regarding work and rest hours. These regulations are only part of the story.
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