n. a slight depression in the smoothness of a surface
n. a minor difficulty
n. a clever method of doing something (especially something new and different)
v. make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in
n. 皱纹, 妙计, 方法, 技巧
vi. 起皱
vt. 使起皱纹