Dave Thomas: A helicopter has four main controls: foot pedals, collective pitch lever , cyclic, and throttle. The foot pedals control the tail rotor.
戴夫·托马斯：直升机有四个主要的控制器：脚踏板、总距操纵杆、周期变距操纵杆以及气门。
The main controls on karst reservoirs are : lithology, depositional environments, hydrology, ancient landform, fractures and weathering time and so on.
控制岩溶发育的主要因素有：岩性及沉积环境、水动力条件、古地形因素、断裂与裂缝发育情况和风化淋滤时间等。
The main controls on karst reservoirs are : lithology, depositional environments, hydrology, ancient landform, fractures and weathering time and so on.
控制岩溶发育的主要因素有：岩性及沉积环境、水动力条件、古地形因素、断裂与裂缝发育情况和风化淋滤时间等。
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