The paper discusses the criterion for deciding virtual constraint and the sufficient and necessary conditions for the constraint existing in mechanisms.
本文论述了机构中存在虚约束的充分必要条件及虚约束的判定准则。
On-demand manufacturing could eliminate that constraint, leading to a world where products are always available, nothing ever gets discontinued, and the virtual shelves are always stocked.
按需制造或能去除这种限制，并将我们带向另一个世界，在那里，产品随处都有，永不断货，虚拟的货架也总是满满当当的。
Assembly constraint is the key information for supporting the assembly operation in distributed virtual environments.
装配约束是用来支持分布式虚拟环境中装配交互操作的关键信息。
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