求翻译：　　7、奶糊加热到75°C的时候，离火，放到装了冰块和水的大碗里，送入冰箱冷藏室，等奶糊凉透。（如果手边没有厨房用的温度计，可以根据奶糊的厚度来决定是否可以离火，用个小勺子，在奶糊里搅一搅，拿起来，如果奶糊能够在勺子背面能够比较厚的挂住一层，就可以了。不过，这个要靠经验，很容易导致奶糊过热或者不够热，还是用温度计来的可靠些。）是什么意思？

　　7 when heated to 75 ° c, milk paste, close to the fire, put it into a large bowl of ice and water, into the fridge freezer, cool milk paste. (If you do not have kitchen thermometers, based on milk paste to decide whether the thickness of the fire, with a small spoon and a stir in the milk paste, pick up, if you paste in back of a spoon of milk to hang a layer of relatively thick, it can be. However, this depends on experience, can easily result in overheating or hot enough milk paste, or with a reliable thermometer to some. ）