也就在反应期间,我有个合理假设，动量是守恒的。
It's just during the impact I claim that to a reasonable approximation, momentum will have to be conserved.
在某些条件下，在化学反应期间，化学能还能以除了热能以外的其他形式释放出来。
Under some conditions chemical energy is liberated during a chemical reaction in forms other than heat.
采用免疫学方法和电生理实验技术，研究了免疫反应期间家兔迷走神经中枢端和外周端放电的变化。
The discharge changes of vagus centripetal end and centrifugal end in rabbit inoculated with tuberculin were studied by immune method and electrical physiological technique.
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