这个SPU上下文会被当成一个类似的物理spu对待，当前的实现可以在它们之间强制进行直接映射。
This SPU context is treated like a physical SPU, and the current implementation enforces a direct mapping between them.
JPA规范定义了对映射继承的三种类型的支持；其中只有一种在当前规范中是强制的
The JPA specification defines three types of support for mapping inheritance; only one is mandatory in the current specification
虽然内存使用从没蔓延，但是我们的应用在每妙秒中处理和映射200个命令时强制的执行了有意义的垃圾收集。
Although memory use never crept up, our application forced significant garbage collection when processing and mapping 20 commands per second.
只有等到这些强制性命令已经被选择，您才可以分配这个字段的映射。
You cannot assign the field mappings until these mandatory fields are populated.
对于语义web来说，强制采用统一的标识符甚至惯例都是不可能的任务，无论您支持RDF还是支持主题映射。
Trying to impose universal identifiers or even conventions for identifiers is an impossible task for the Semantic Web, whether you're a proponent of RDF or topic maps.
对于语义web来说，强制采用统一的标识符甚至惯例都是不可能的任务，无论您支持RDF还是支持主题映射。
Trying to impose universal identifiers or even conventions for identifiers is an impossible task for the Semantic Web, whether you're a proponent of RDF or topic maps.
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