3 sentences

1. 做蛋糕时，需要先将蛋白打发。

   zuò dàn​gāo shí, xū​yào xiān jiāng dàn​bái dǎ​fā.

   When making a cake, you need to whip the egg whites first.

   Source: Dong Chinese Dictionary

2. 做蛋糕时，通常需要将蛋黄和蛋白分离。

   zuò dàn​gāo shí, tōng​cháng xū​yào jiāng dàn​huáng hé dàn​bái fēn​lí.

   When making a cake, you usually need to separate the egg yolks from the whites.

   Source: Dong Chinese Dictionary

3. 大豆含有丰富的优质蛋白。

   dà​dòu hán​yǒu fēng​fù de yōu​zhì dàn​bái.

   Soybeans are rich in high-quality protein.

   Source: Dong Chinese Dictionary