Forecasting was an inexact science.

预报是门不精确的科学。

《柯林斯英汉双解大词典》

Forecasting floods is not an exact science.

预测洪水不是一门精密科学。

《柯林斯英汉双解大词典》

Since budget forecasting is more an art than a science, revenue “surprises” are common..

既然预算预测更像是一门艺术而不是一门科学，收入“惊喜”是普遍的。

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Unfortunately for the science of earthquake forecasting (though fortunately for the residents of Parkfield and Tokyo), neither of the predicted shocks has yet happened.

ECONOMIST: Nature rarely repeats itself

"Traffic forecasting is not an exact science, " agrees Michael Demetsky, head of the Center for Transportation Studies in Charlottesville, Va.

NPR: Bumper to Bumper: Predicting Traffic Flow

Anyone that's ever tried to plan an outdoor activity in advance knows that weather forecasting is not an exact science, but the perpetual sky-watchers at NASA may have inadvertently found a way to improve these guesstimations.

ENGADGET: NASA accidentally improves weather forecasting with lunar dust-measuring lasers