smooth

The pebble had been worn smooth by years of flowing water in the river.

(Chinese) 由于河水多年的冲刷，这块卵石已被磨得很光滑。

He applied a special wax to make the surface of the wooden table feel smooth.

(Chinese) 他涂了一种特制的蜡，使木桌表面摸起来很光滑。

The transition to the new computer system was surprisingly smooth for the staff.

(Chinese) 对员工来说，向新电脑系统的过渡出奇地顺利。

He is a very smooth speaker who can convince anyone to support his ideas.

(Chinese) 他是个口才非常流利的人，能说服任何人支持他的观点。