Coolant is a liquid used to keep a machine or engine cool while it is operating. 冷却剂
noun [专属名词]冷却剂
Another module continued to pump coolant through a separate loop, but astronauts had to power down non-essential equipment to prevent overheating. 另一个模块继续通过一个单独的循环泵入冷却剂,但宇航员不得不关掉不必要的设备以防止过热。