Speed and reliability in travel search, especially around flights, is an extremely difficult area to master.
旅游搜索的速度和可靠性最难掌控，尤其是对于机票搜索。
Northeast Asia is not only an important area in the regional cooperation in China, but also a difficult area.
东北亚地区既是中国开展区域经济合作的重点地区，也是难点地区。
It is a common problem to survey some boundary points in difficult area during the implementation of cadastral surveying.
地籍测量中对某些可望而不可及的界址点的测量是经常遇到的问题。
The technique of feature extraction of ship-radiated noise is of importance to underwater equipment, and it is a hotspot and difficult area in the national and international research.
舰船辐射噪声信号的特征提取技术因其在水下装备中具有重要的应用价值，一直是国内外研究的热点和难点。
The technique of feature extraction of ship-radiated noise is of importance to underwater equipment, and it is a hotspot and difficult area in the national and international research.
舰船辐射噪声信号的特征提取技术因其在水下装备中具有重要的应用价值，一直是国内外研究的热点和难点。
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