have been studied systematically 系统研究了
has been studied systematically 系统研究了
has been systematically studied 进行了系统研究
But the research on impacts of climate changes on karst ecosystem hasn't been studied systematically at home now.
但关于气候变化对岩溶生态系统的影响，国内尚未有系统的研究工作。
Influencing factors to the uniformity of coating thickness for alkaline zinc plating have been studied systematically by Hall-cell test.
采用霍尔槽试验对碱性镀锌镀层厚度均一性的影响因素进行了研究。
The mixed convection phenomena in the sodium pool of fast reactor have been studied systematically by the two dimensional modeling method.
利用二维模拟方法对快中子反应堆钠池内混合对流现象进行了系统研究。
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