"Make a cake for oneself" 可以翻译为 "给自己做蛋糕"。这个短语的来源可能是英语中常见的一种描述自己做东西的方式，即 "make + something + for + oneself"。
例句：
I'm going to make a cake for myself. (我要给自己做一个蛋糕。)
She made a cake for herself to celebrate her birthday. (她为了庆祝生日而给自己做了一个蛋糕。)
He decided to make a cake for himself as a reward for all the hard work he had done. (他决定为自己做一个蛋糕，作为自己所有辛勤工作的奖励。)
例句：
I'm going to make a cake for myself. (我要给自己做一个蛋糕。)
She made a cake for herself to celebrate her birthday. (她为了庆祝生日而给自己做了一个蛋糕。)
He decided to make a cake for himself as a reward for all the hard work he had done. (他决定为自己做一个蛋糕，作为自己所有辛勤工作的奖励。)