This is to free the air bubbles from the car engine cooling system.
这是自由的空气泡从汽车发动机冷却系统。
To keep the engine temperature in balance, a cooling system is necessary.
为保持发动机温度平衡，就必须有冷却系统。
The engine cooling system actually is a temperature-regulation system.
发动机冷却系统实质是温度调节系统。
The engine cooling system actually is a temperature-regulation system.
发动机冷却系统实质是温度调节系统。
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