Always add sugar in a stream, slowly at the side of the bowl while the whites are being whipped.Avoid dumping it in the centre, unless you want to experience how beaten egg whites deflate.

• 要注意砂糖要沿着盆壁渐渐加入，不要一股脑往蛋白中央一倒，要不然已打起的蛋白霜可能就会消泡了。