洗面奶在英语中可以翻译为 "facial cleanser"。这个词源于拉丁文，"facialis" 指的是 "脸部的"，"cleanser" 指的是 "清洁剂"。例如：

I use a facial cleanser every morning to wash my face.

(我每天早上都用洗面奶洗脸。)

This facial cleanser is gentle and effective.

(这款洗面奶质地温和，效果好。)

Can you recommend a good facial cleanser for sensitive skin?

(你能推荐一款适合敏感肌肤的洗面奶吗？)