求答案~一个句子的翻译及句法分析

求答案~一个句子的翻译及句法分析
For years, farmers mistrusted speculative grain selling as carried on through the Winnipeg Grain Exchange.as后面的怎么回事,什么意思.还有一句也顺便帮我看了吧On various occasions, producer groups asked for firmer controls, but governments had no wish to become involved, at least not until wartime wheat prices threatened to run wild. 主要是最后半句.怎么回事

For years,farmers mistrusted speculative grain selling as carried on through the Winnipeg Grain Exchange
多少年来,农民们对温尼伯粮食交易所进行的投机性粮食买卖一直持怀疑态度；
as翻译为“当”,其后省略了grain selling was

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