光滑（指表面），玻璃般的，天鹅绒般的，柔软的

1. smooth (of a surface), glassy, velvety, soft

adjectival nouns or quasi-adjectives (keiyodoshi)

顺畅（指动作、程序等），流畅（指言语），流畅，毫无障碍

2. smooth (of an action, proceedings, etc.), fluent (speech), fluid, trouble-free

adjectival nouns or quasi-adjectives (keiyodoshi)

连续可微

3. continuously differentiable

adjectival nouns or quasi-adjectives (keiyodoshi) mathematics