They are more common in summer than in winter, and difficult to predict.
这种情况在夏天比冬天更常见，也很难预测。
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。
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。
The demand and supply for the stock is very difficult to predict.
股票的需求和供应是很难预测的。
The demand and supply for the stock is very difficult to predict.
股票的需求和供应是很难预测的。
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