Such rules may concern a geographical area (e.g. a treaty on the protection of a particular river) or some substantive matter (e.g. a treaty on the regulation of the uses of a particular weapon).
这些规则可能涉及一个地理区域(例如关于保护特定河流的条约)或一些实质事项(例如关于管制特定武器之使用的条约)。