雅思TASK1小作文模拟题:科学技术 Technology

The ice cream making process has five key stages. In the first stage, sugar, cream and milk are mixed together in a 3,000 gallon vat to make the basic ice cream mix. In stage two, this mix is pasteurised, or heated to 70 degrees centigrade for 20 seconds, to kill any bacteria. After that, flavour such as chocolate, vanilla or strawberry is added and mixed using steel blades. In the fourth stage, the mix is frozen in a tube to -10 degrees centigrade and at the same time it is whipped by blades to prevent ice crystals forming. Finally, the ice cream is packed into boxes and stored in freezers.