smoothest

He straightened his tie nervously and smoothed (down) his hair.

他紧张地整了整自己的领带，捋了捋头发。

We must do more to smooth the country's path to democratic reform.

我们必须再接再厉，为国家的民主改革铺平道路。

Pour some oil into the palm of your hand and then smooth it over your arms and neck.

往手掌中倒一点油，然后轻轻涂在手臂和脖子上。

The road ahead was flat and smooth.

前面的路平坦光滑。

We had a very smooth flight with no turbulence at all.

我们的飞行很顺利，没有碰到强气流。

This coffee is incredibly smooth and rich.

这种咖啡的味道醇香浓郁。