填空题 Most of the problems in physics can't be solved exactly in closed form. Therefore we have to learn technology for making clever 1, such as power series expansions, saddle pint integration, and small(or large)perturbations.(approximate)
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【正确答案】 1、正确答案：approximation    
【答案解析】解析：句意：大多数物理问题都不可以用封闭的模式来解决。因此我们有必要学习求近似值的方法，比方说幂级数展开法、鞍点积分法、大小偏差原理等。approximation：[数]近似值。