An entry can have mandatory attributes or optional attributes.
条目可能会具有必须的属性或可选属性。
All 50 states now have mandatory seat-belt and child-restraint laws.
全美五十个州均实施了强制使用安全带和儿童椅的法律。
RSS items such as enclosure that have mandatory attributes are passed through structures whose members provide those values.
enclosure等具有强制属性的rss项通过一种结构来传输，这种结构的成员提供了这些值。
The rate of automobile fatalities in states that do not have mandatory seat belt laws is greater than the rate of fatalities in states that do have such laws.
没有强制戴安全带法律的州的汽车死亡事故率比有该项法律的州要高。
The rate of automobile fatalities in states that do not have mandatory seat belt laws is greater than the rate of fatalities in states that do have such laws.
没有强制戴安全带法律的州的汽车死亡事故率比有该项法律的州要高。
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