reciprocating cold oil pump

例句：

1. 1.The reciprocating pump is used to circulate water in the cooling system.
   往复式泵用于冷却系统中的水流循环。
2. 2. The reciprocating pump is a common component in many mechanical systems.
   往复式泵是许多机械系统中常见的组件。
3. 3. The reciprocating pump has been found to be more efficient than other types of pumps.
   研究发现，往复式泵比其他类型的泵更高效。