Self-raising flour contains a raising agent, but if you only have plain flour on hand, add 2 tsp of baking powder to 1 cup of plain flour.(自發粉里面已經含有發酵介質，如果你手頭只有普通面粉，那么一杯普通面粉應加2茶匙泡達粉。)

We have made it clear in our inquiry that the 1000 ton self-raising flour should arrive here by May 30, 2006, and that it should be packed in plastic bags of 5 kilo per sack for sales.(我們在信中已明確告訴貴方，我們擬購的1000噸自發粉必須在2006年5月30日前抵達這里，且必須用塑料袋包裝，每袋5公斤，以便銷售。)

You can substitute plain flour if you cannot find self-raising flour.(如果你找不到自發面粉，可以用普通面粉來代替。)