bicarbonate of soda
noun [ U ] mainly UK uk/baɪˌkɑː.bən.ət əv ˈsəʊ.də/ us/baɪˌkɑːr.bən.ət əv ˈsoʊ.də/ (US usually baking soda)
碳酸氢钠，小苏打
a white powder used to make foods rise when they are baked
Mix together 250 g plain flour and a teaspoon of bicarbonate of soda and then add to the cake mixture. 将250克纯面粉与一茶匙小苏打搅拌在一起，然后加入蛋糕粉中。
Synonym: sodium bicarbonate