sebum

例句：

1. 1. The soap made from this oil is very soft and moisturizing.
   这种由油制成的肥皂非常柔软且保湿。
2. 2. The skin needs a good amount of sebum to stay healthy.
   皮肤需要适量的油脂来保持健康。
3. 3. The hair needs a good amount of sebum to keep it shiny and healthy.
   头发需要适量的油脂来保持光泽和健康。