做蛋白霜需要打发蛋清直到它变得蓬松。

To make meringue, you need to whip the ___egg whites until it becomes fluffy.

这杯奶茶上面漂浮着像蛋清一样细腻的奶沫。

The milk tea had a delicate foam on top that resembled ___egg-white.