Pitch level has varied according to location, time and other factors.
音高水平根据地点、时间和其它因素变化。
In electrohydraulic force control system, it is a difficult problem to solve some control qualities such as wave distortion caused by non-linear and time -varied factors.
电液力控制系统中非线性和时变因素引起的波形畸变等控制品质问题是电液控制系统中较难解决的问题。
Because there are many factors that affect the pricing of new house, each factor varied all the time, and all factors influence each other, it is difficult to forecast the price trend of new house.
因为影响房地产销售价格因素较多，而且各个因素不断变化，互相影响，因此要预测房地产销售价格走势比较困难。
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