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。
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。
If there happens to be air bubbles in their engine cooling system, it may cause their cars to malfunction.
如果刚好气泡在发动机冷却系统，这可能会引起他们的汽车故障。
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