数据的定时限制和事务的定时限制。

Timing constraints in real time database systems have data timing constraints and transaction timing constraints.

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因此有必要对嵌入式实时事务进行有效预分析和预处理，以支持实时事务实现定时限制。

So it is necessary to make efficient preanalysis and preprocess on the em-bedded real-time transactions for supporting the implementation of real-time transaction's timing constraint.

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在规定时限内，未经飞行管制部门许可的航空器，不得飞入空中限制区或者临时空中限制区。

Within the specified time limits, no aircraft may enter restricted areas or temporary restricted areas without permission from the flight control department.

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在规定时限内，未经飞行管制部门许可的航空器，不得飞入空中限制区或者临时空中限制区。

Within the specified time limits, no aircraft may enter restricted areas or temporary restricted areas without permission from the flight control department.

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