main profile短语²²⁶⁶³ 基本例句 基本句法子集 In order to predict mining subsidence behaviours of the surface in extracted area, the movement of any point is often expressed by multiplication of two main profile functions. 地下开采所引起的地表任意点下沉，通常是以走向和倾向断面下沉函数的乘积表示。 chemyq