但是，如何使膜过滤能够长期、高效、稳定的运行，是目前膜分离技术需要解决的关键问题。

But the most crucial problem of membrane separation technology at moment is how to make it long, high and stable operation.

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因此，如何对第三代移动通信系统基站系统进行测试并使3g网络正常高效的运行已经成为许多3g厂商必须考虑和解决的一个重要问题。

Therefore, it is an important subject having to be considered and resolved by many 3g vendors that how to measure 3g Base Station System and maintain the network running properly and efficiently.

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如何产生高效的量子信号，是量子密钥分配系统安全运行的关键。

The key to a sound QKD system is how to generate highly effective quantum signal.

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