Sugar and yeast together in the flour, it will rise, because the right amount of sugar can provide some nutrients to the yeast inside the yeast, which will help fermentation. But too much sugar will inhibit the fermentation of the yeast, so make sure you control the amount of sugar when you put it in.

Add the right amount of sugar to the dough containing yeast, the sugar will provide some nutrients to the yeast, but the ratio of sugar should be kept under 8% of the total weight, if it is more than 8%, it will inhibit the effect of yeast. Normally yeast will use up 2% of the sugar in 8 hours, so 8% sugar will give the yeast about a day and a half to two days worth of nutrients, which will make the dough rise better.

Usually, yeast and sugar are often used together in steamed buns to improve the flavor of the buns. If you use yeast alone to make the dough, the steamed buns won't taste very good, so you need to combine it with sugar or salt to increase the flavor. When the steamed bread made with yeast does not taste very good, you can try to add the right amount of sugar to try.