It has been a big and difficult problem that the uncontrolled rocket has large dispersion and low firing accuracy.
无控火箭的老大难问题是散布大，射击精度差。
We are now at the point where the dimensionality and size of the data is a big problem. It makes things computationally very difficult to find these patterns we want to find.
他补充道，“在这里，数据的维数和容量是个大问题，要依靠计算来找到我们想要找寻的模式会变得极为困难。”
Multitarget interception is a big difficult problem in ballistic missile defense, and is also the most arduous technology of the missile defense system of US.
多目标拦截是弹道导弹防御的重大难题，也是目前美国导弹防御系统所遇到的最大的技术难点。
But distilling tower temperature control is a typic big time-lag system, and the control of it is always a difficult problem in coak producing industry.
但由于氨塔温度控制属于典型的大时滞系统，对这种系统的自动控制一直是焦化生产控制中的一个难题。
The leakage rate of building' s insulation roof is usually high, and its leak renovation problem has been longstanding, big and difficult.
建筑保温屋面渗漏率高，渗漏修缮是个老大难问题。
The leakage rate of buildings insulation roof is usually high, and its leak renovation problem has been longstanding, big and difficult.
建筑保温屋面渗漏率高，渗漏修缮是个老大难问题。
The leakage rate of buildings insulation roof is usually high, and its leak renovation problem has been longstanding, big and difficult.
建筑保温屋面渗漏率高，渗漏修缮是个老大难问题。
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