例句：

　　His sales pitch was smooth and convincing.

　　他的推銷(xiāo)辭令流暢且令人信服。

　　This exercise is done in one smooth motion.

　　這套體操是由一個(gè)流暢的動(dòng)作完成的。

　　He had shaved his face until it was smooth.

　　他把臉刮到光滑為止。