To provide reliable data communication which can meet the requirements of real-time control is a technical key problem when two-leve microcomputer control is put into action.

提供能满足实时控制要求的可靠的数据通信，是实现两级微机控制的一个技术关键。

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Design contour curves of the stator transition zone is a technical key-problem for the design of double-acting vane pump of high-performance.

定子过渡曲线的设计是高性能双作用叶片泵设计的技术关键。

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"Other than some type of key-recoverable system, there is currently no viable technical solution to this problem for law enforcement, " he said.

BBC: Security and law enforcement: the government view