As one of natural fires, its mechanism is very complex and difficult to control.
雷击火作为天燃火源是一种难以控制的自然现象，其形成机理极为复杂。
They are often events difficult to predict, prevent and control.
这些事件往往难以预料、预防和控制。
These shops are seen as increasingly expensive, risky, and obviously difficult to manage or control.
这些商店被视为太过昂贵、有风险且明显难以管理或控制。
When the headmaster feel this group of quiet child than noisy when more difficult to control, and she do?
当校长觉得这群安静的孩子比吵闹的时分更难以控制时，她又会怎样做？
It is very difficult to control the dimension and surface quality when processing elastic material.
对于非金属弹性材料的加工，难点在于如何控制尺寸及表面质量。
Plus, the device is expensive, noisy, and notoriously difficult to control.
另外，这种设备也比较昂贵而且噪音很大，相当难控制。
The amount and allocation of land uses are difficult to predict and control.
各类用地规模缺乏规划调控，规模难以预测。
Time is tricky. It is difficult to control and easy to waste.
如何处理好时间是件棘手的事，它既难控制又易浪费。
It is complex and difficult to design the control model by traditional control theory.
这使得采用常规的控制理论进行控制器设计变得非常复杂和困难。
It is difficult to control and easy to waste.
既难以控制好，又很容易浪费掉。
It is difficult to control and easy to waste.
既难以控制好，又很容易浪费掉。
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