Перевести beef is from the french "boeuf" which means cow,and pork comes from the french "porc"-pig.likewise mutton-is from the french "mouton" sheep.when britain was invaded by the normans,these were the main farm animals.poor farmers who were looking after the animals called them by their anglos-saxon names of cow,pig and sheep.the rich norman lords called the meat they ate by their french names.as the two languages formed the english we now speak,the meats kept different names from the animals