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。

youdao

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。

youdao

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。

youdao

Things that might have been optional in the past for job seekers are now mandatory.

VOA: standard.2010.07.28

Another 106 signatories do not have mandatory requirements, but participate in the process and have incentives to curb emissions.

CNN: A truly global problem

They now have mandatory playdough playtime during strategy meetings, to help stimulate their brains and keep everyone in a playful, creative mindset.

FORBES: The 2 Most Important Words in Business

They all have had a strong position on the need to have mandatory limits and the cap-and-trade system that drives costs down.

FORBES: Market Man