It must be thinned before whipping by the addition of 1 part of cold milk, iced water, or shaved ice for every 3 parts of cream.
在搅打前一定要按1份冷牛奶，冰水或刨冰和3份奶油的比例将奶油调稀。
2
That highly torturous fluid in the cave that Dumbledore drinks, this was really just some milk thinned down with water and then visually "tweaked" by the CG department.