1、"dessert" 是一个名词，意思是 "甜点"，指餐后吃的甜食。
例如：
I had a piece of cake for dessert.我吃了一块蛋糕当愁娃没甜点。
Chocolate mousse is my favorite dessert.巧克力慕斯是我最喜欢的甜点。
2、"desert" 是一个名词和动词，意思分别为 "沙漠" 和 "放弃"。
作为名词时裁倘，例如:
Many animals have adapted to the harsh conditions of the desert.许多动物已经适应了沙漠的恶劣条件。
作为动词时，例如:
She deserted her post without permission.她未经允许畜兼就抛弃了她的职位。