wrinkle
n.皱纹 vi.起皱

Imagine a tub of frozen yoghurt, not a single line or wrinkle.
想象一下一桶没有一条线或皱纹的冻酸奶吧。
From where we are in the orchestra, you can see every wrinkle on her face.
从我们所在的正厅位子上，你能看到她脸上的每根皱纹。