以下为句子列表：
英文: Because the oil well pump belongs to a simplex reciprocating pump, the most authentic Adolph's differentical equation of movement of the reciprocating pump valve can be used to reserch the movement of oil well pump valve,but it is well known that this dif
中文: 由于抽油泵属于单缸单作用往复泵，因此可以将目前较权威的阿道尔夫往复泵泵阀运动微分方程用于研究抽油泵泵阀的运动规律，但阿道尔夫泵阀运动微分方程在泵阀开启初期存在奇点问题。
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英文: The movement of valve of the oil well pump has not been researched perfectly in theory,and the mathematical models used to describing the movement of the oil pump valve are too simple.
中文: 目前抽油泵泵阀运动规律的理论研究还很不完善，所采用的数学模型也过于简单。
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