1. The snake twisted, humped up, then became flat.
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then became flat
然后变平了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The obtained integral cross section decreased quickly at low collision energy and then became flat, which reflected the general feature of such exothermic reactions.
计算得到的反应截面在碰撞能量很低时下降很快，然后变得比较平坦，其变化趋势与实验测量的结果相吻合，呈现出强放热反应的基本特征。
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