face of an instrument

例句：

1. 1.The face of the new president is veryserious.
   新任总统的面容非常严肃。
2. 2. Shegave a warm smile to greet her guests.
   她向客人露出了温暖的微笑。
3. 3. The artist's face was covered in paint.
   艺术家的脸上被颜料覆盖。