Lipids include a variety of structure types, For example H2C-O-C-R CH3 CH2OH HC-O-C-R O CH3 HC-0-C-R CH(CH3h A fat or oil Menthol Vitamin a (油或脂) (薄荷醇) (维生素A) H,C-0-C-R HRCI H HC-0-C—R CH, H H2C-O-P-OCH2CH2N+ CH3)3 lecithin Cholesterol (卵磷脂) (胆固醇Lipids include a variety of structure types, For example H2C HC H2C O C R O C R' O C R'' O O O CH3 OH CH(CH3 ) 2 CH2OH CH3 CH3 CH3 CH3 A fat or oil (油或脂） Menthol (薄荷醇) Vitamin A (维生素 A） H2 C HC H2 C O C R O C R' O P OCH2 CH2N+( CH3 ) 3 O O O O - H H H 3 C H3 C H H H HO CH3 Cholesterol (胆固醇) lecithin (卵磷脂)