flat face

例句：

1. 1. She had a flat face that made her look older than she was.
   她有一个扁平的脸，让她看起来比实际年龄要大。
2. 2. The doctor advised him to keep his face flat and avoid any unnecessary movements.
   医生建议他保持脸部平直，避免做任何不必要的动作。
3. 3.The man's face was so flat that it looked like a mask.
   那个人的脸太平了，看起来像面具。