将蛋白打至硬性发泡。

___Beat the egg whites until they form stiff peaks.

你应该充分搅拌面糊以避免结块。

You should ___beat the batter well to avoid lumps.

要做出完美的蛋白酥，需要高速搅拌混合物。

For the perfect meringue, ___beat the mixture at high speed.