The course of life never runs smoothly for it is full of ups and downs and twists and turns.

人生之路从不一帆风顺，因为它充满了起伏与曲折。

youdao

The machine runs smoothly.

机器运转平稳。

《新英汉大辞典》

Caroline:... and to make sure the business runs smoothly.

卡罗琳：另外，我还要确保整个公司运转顺利。

youdao

Like in Premiere Pro, the program runs smoothly enough to let us edit images in real time.

ENGADGET: NVIDIA Quadro K5000 GPU for Mac offers significant Premiere Pro performance boost, we go hands-on

At the same time, an electric grid runs smoothly only when there is a balance of supply and demand.

FORBES: Feds Fund Four Projects To Simplify Solar Gear Designs and Predict Power Output

Cemex, in short, is a company that runs smoothly on all cylinders.

FORBES: Cement meets the cyberworld