汤姆的决定（Tom's decision）是指汤姆做出的决定。这句话的来源可能是指汤姆做出了一个决定，并且需要用英语来表达。例句：
Tom's decision to move to a new city was met with mixed reactions from his friends.（汤姆决定搬到一个新城市，他的朋友们的反应不一。）
After careful consideration, Tom made the decision to quit his job and start his own business.（经过慎重考虑，汤姆决定辞掉工作，开始他自己的生意。）
Tom's decision to go back to school was supported by his wife, who bepeved it would lead to better opportunities for their family.（汤姆决定回到学校，他的妻子支持他的决定，她相信这将为他们的家庭带来更好的机会。）
在这些例句中，"Tom's decision" 是指汤姆做出的决定，并且在句子中起到了重要的作用。