It's like a spongecake with like cream on the inside of it.
- 就像一块海绵蛋糕,里面有奶油。
英语百科
Sponge cake
Sponge cake is a cake based on flour (usually wheat flour), sugar, and eggs, and is sometimes leavened with baking powder. It has a firm, yet well aerated structure, similar to a sea sponge. A sponge cake may be produced by the batter method or the foam method.