快速答案
trocar 表示用一个物品替换另一个；mudar 表示改变状况或搬迁。
可靠的方法是先判断这个词在句子里的功能，再翻译。
每个词的作用
trocar
to exchange, replace, or switch
Use trocar for one thing taking the place of another, often in a direct swap.
mudar
to change or move
Use mudar for a change of state, habit, opinion, address, or residence.
如何选择
- trocar: Choose trocar if the sentence points to one thing taking the place of another, often in a direct swap.
- mudar: Choose mudar if the sentence points to a change of state, habit, opinion, address, or residence.
例句
Vou trocar esta camisa.
I am going to exchange this shirt.
Nós vamos mudar de cidade.
We are going to move to another city.
常见误区
For clothes, money, seats, or one object for another, trocar is usually precise. For life changes and moving house, use mudar.
放到语境中练习
从你的真实生活中选一个句子，写两遍：一次用 trocar，一次用 mudar。如果两个版本都可以，说明意思怎样变化。