Because of inadequate preparation for the theory and lack of the thorough study, Problems exist both in theory and in practice.
由于理论准备不足，研究不够深入，在理论和实践上都存在一些问题。
The couples asked not to be named since both are currently going through the waiver process by admitting to alcohol problems they do not believe exist.
他们请求不要署名，因为，在他们承认了自己并不认为存在的酗酒问题后，他们当下得以经过豁免程序。
Great challenges and barriers exist in both theory and practice due to the NP-hard of layout problems in computation complexity and alarming difficulties in the design of spacecraft themselves.
布局问题的NP -困难性和航天器设计本身的巨大复杂性使得该问题的解决既有理论上的开拓性和挑战性，又存在工程实践上的艰难性和复杂性。
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