A study published last Wednesday in Science Advances reveals that sebum made of cholesterol, diacylglycerols and fatty acids-also known as grease-keeps ice from accumulating on polar bear hairs.

上周三发表在《科学进展》上一项研究表明，由胆固醇、二酰脂肪酸（也为脂）组脂可以防止冰在北极熊毛发上积聚。

See, phorbols mimic the action of diacylglycerol — a fatty molecule your body uses in a number of ways, including to activate an enzyme called protein kinase C, or PKC for short.

因为佛波醇类模拟了二酰基活动，二酰基这种脂肪分子在你身体里有很多作用，它能激活一种蛋白激酶C，简PKC。