secondary coolant

例句：

1. 1. The engine needs a secondary coolant to maintain its temperature.
   发动机需要一种次要冷却剂来保持其温度。
2. 2.The chemical engineer used a secondary coolant to solve the problem.
   化学工程师使用了一种次要冷却剂来解决这个问题。
3. 3. The heat exchanger uses a secondary coolant to transfer heat from one fluid to another.
   热交换器使用一种次要冷却剂将一种流体的热量传递给另一种流体。