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《学进展》上的一项研究明，由胆固醇、二酰甘油和脂肪酸（也为油脂）组成的皮脂可以防止冰北极熊的毛发上积聚。

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甘油的活动，二酰基甘油这种脂肪分子你的身体里有很多作用，它能激活一种蛋白激酶C，简PKC。