植物中的植物固醇是一种对人体有益的天然固醇。

Phytosterols, a type of ___sterol found in plants, are beneficial to human health.

医生建议我在早餐麦片中添加植物固醇来帮助降低胆固醇。

The doctor suggested adding plant ___sterols to my breakfast cereal to help reduce cholesterol.