a chocolate cake的用法和样例：
- My wife baked a chocolate cake for my birthday.
- My first attempt at a chocolate cake tasted horrible.
- Can I have a chocolate cake for dessert?
- All he asked for was a chocolate cake or a kiss,"she told him.
- Yesterday he went to my home and I made a chocolate cake for hime.
- Marie: Thank you, Justin. Well, it's time for dessert. I made a chocolate cake.