For South Downs, complex terrain features of small plots of farmland, This paper attempts to use hollow UAV explore new ......

本文列举震前低温降水与强震相对应的案例。指出这种对应关系的内在机制是:震前地壳内应力增强裂隙增多,使地下气体大量逸出,大气......

Although it was still snowing in late February in northwestern China,an early spring breeze was slowly making its way ac......