Someone discovered that animal grease or fat rubbed into the inner side helped the leather to become soft.

有人发现，动物油脂或脂肪擦到皮革内有助于皮革变得柔软。

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Later, someone discovered that animal grease or fat rubbed into the inner side helped the leather to become soft.

后来，一些人发现把动物的油脂或脂肪擦到皮革的内层，可以帮助皮革变柔软。

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In this town the grease always rises to the top, so I strained the juice and skimmed off the fat.

在这座城里，人人都对油脂心存畏惧，所以我将汤汁过滤了一遍，撇去上面的油。我又加了更多的水，把锅放回到炉灶上。

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Or to be more specific, a diet that consists of something other than sugar, fat, grease and more sugar, fat and grease.

WSJ: Louisville: Winning With a Helping of Grease and Sugar��NCAA Tournament

The firm is deploying organically grown bacillus bacteria, which is commonly found in the human gut, to eat the fat, oils and grease.

BBC: Fat-eating bacteria put in Hull sewers to remove blockages