由于无法对其进行足尺模型试验，数值分析就成为此类结构设计的重要依据，也是悬索桥设计中的难点和关键问题之一。
Since it is hard to perform a full-scale model test, numerical analysis becomes an important basis and also one of the most difficult and pivotal problems in design.
因此如何准确估算出差错环境下从编码器到解码器端的失真度，并由此来决定编码模式就成为率失真优化的关键问题。
Therefore, how to estimate precisely the distortion between the codec in error prone environments in order to choose the coding mode is the key problem of rate-distortion.
因此，如何获得准确的MIMO信道状态信息就成为一个关键问题。
Therefore, how to get the MIMO channel information correctly becomes a crucial problem.
因此，提高联机分析处理的查询性能就成为了数据仓库领域的关键问题。
Therefore, improving the OLAP query performance becomes the key issue in the field of data warehouse.
底部排气弹是性能优良的远程弹，就目前底排弹研制的实际增况来看，如何减小射弹散布已成为提高底排弹技术指标的关键问题之一。
For the development of the base-bleed projectile, how to reduce the projectile distribution is the key technology to improve the base-bleed projectile's performance.
当风险成为众多关键问题中唯一必须要解决的问题时，那我们就一定要去应对它。
While risk is only one of many critical issues management must get right, it's certainly one that needs to be addressed.
因此如何进行传感器网络的传输功率控制，以低的能耗保证网络数据传输性能就成为了传感器网络中的关键问题。
How to control the power during transmission to satisfy data transmission requirement with low energy consumption becomes an important problem in WSN.
因此如何进行传感器网络的传输功率控制，以低的能耗保证网络数据传输性能就成为了传感器网络中的关键问题。
How to control the power during transmission to satisfy data transmission requirement with low energy consumption becomes an important problem in WSN.
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