It is difficult to forecast stock market trends.
股票市场趋势很难预测。
Of course, exchange rates are notoriously difficult to forecast.
当然，汇率变动的预测之难是众所周知的。
Its forecast is difficult due to too many affecting factors.
由于其受多种因素影响，对其预测相对困难。
Its forecast is difficult due to too many affecting factors.
由于其受多种因素影响，对其预测相对困难。
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