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。
It is very difficult to forecast the allowance price, because there are many factors which have an effect on it.
这是很难预测的税额价格,因为有许多因素都影响了它。
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