引擎现在运行得更平稳了。

The engine is ___running more smoothly now.

停车时请不要让引擎一直运转。

Please don't leave the engine ___running while the car is parked.

我们让主服务器持续运行，以确保我们的服务始终可用。

We keep the main server ___running continuously to ensure our services are always available.