The western development is a long term and diffcult process which needs the legal protection in addition to the necessary series of policies.
我国的西部开发是一个长期而艰巨的过程，除了一系列的必要的政策指导外，还需要辅之以系统的法律保障。
Thinking is easy, acting is diffcult, and to put one's thoughts into action is the most diffcult thing in the world.
这句话意思是“想很容易，行动很难，而把想法付诸行动是世界上最难的事。”
With the ever-increasing complexity of the structure of engineering equipment, fault diagnosis is becoming more and more diffcult.
工程设备的结构日趋复杂，使故障诊断的难度不断增大。
The search proved diffcult, for the puma was often observed at one place in the morning and at another place twenty miles away in the evening.
搜索美洲狮确实很困难，因为它常常是早晨出现在某处，而晚上又出现在二十英里外的另一处。
The tactical co operation of the units in battle group is the key to enhance the capability of battle group as a whole, of course, it's very diffcult to achieve it.
群内各兵力的战术协同是提高兵力群整体作战能力的关键，当然也是最难实现的。
The tactical co operation of the units in battle group is the key to enhance the capability of battle group as a whole, of course, it's very diffcult to achieve it.
群内各兵力的战术协同是提高兵力群整体作战能力的关键，当然也是最难实现的。
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