soda water

Please add some soda water to the flour for the cake.→Please add some baking soda to the flour for the cake.

‘苏打水’（soda water）是碳酸饮料，而‘小苏打’（baking soda）是烘焙用的膨松剂。两者中文相近，但英文不同。

I want a can of soda water because I'm thirsty for something sweet.→I want a can of soda because I'm thirsty for something sweet.

‘soda water’特指无味的碳酸水，而甜味的碳酸饮料应直接用‘soda’或具体品牌名。