So the weather satellites are _of_ great help to the scienti

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So the weather satellites are _of_ great help to the scientists
at the station,in the past they could forecast the weather for about 24 or 28 hours earlier.
为什么是of?

of great help =helpful
记住类似的这种用法.

So the weather satellites are _of_ great help to the scienti 以now satellites are helping to forecast the weather开头的英语翻译英语翻译Now satellites are helping to forecast(预报) the weather.T 英语翻译Now satellites are helpful to forecast(预报) the weather.T 英语阅读理解Now satellites are helping to forecast(预报) the weather At one time the little boy would go to see the great scienti 英语问题3the family ____ are about the weather so they listen to 一道英语同义句转换,The satellites are used to send and receive messag 英语翻译They are so sure the weather is going to be fine very qu The plans in the rainforest can help to c___the weather these old men are of great help to the netghourbood ( )they Weather permits,we'll go to the Great Wall.