it_(difficulty) for human beings to predict weather in the past

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it_(difficulty)forhumanbeingstopredictweatherinthepastit_(difficulty)forhumanbeingstopredictweatheri

it_(difficulty) for human beings to predict weather in the past
it_(difficulty) for human beings to predict weather in the past

it_(difficulty) for human beings to predict weather in the past
It ( was difficult ) for human beings to predict weather in the past .
be diffcult for somebody to do sth 意思是“对某人来说,做某事很.”
翻译:在过去对于人类来说预测天气是很困难的.

it was difficult for....