快速答案
tráfego 指交通和流动；tráfico 指非法交易。
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
tráfego
traffic or flow
Use tráfego for the movement of vehicles, data, ships, aircraft, or people through a route.
tráfico
illegal trade or trafficking
Use tráfico for prohibited commerce or movement, especially of drugs, weapons, animals, or people.
如何选择
- tráfego: Choose tráfego if the sentence points to the movement of vehicles, data, ships, aircraft, or people through a route.
- tráfico: Choose tráfico if the sentence points to prohibited commerce or movement, especially of drugs, weapons, animals, or people.
例句
O tráfego ficou lento na ponte.
Traffic became slow on the bridge.
A operação investigou o tráfico de animais.
The operation investigated wildlife trafficking.
常见误区
English “traffic” can point to either word. Vehicles create tráfego; illegal commerce constitutes tráfico.
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 tráfego，一次用 tráfico。如果两个版本都可以，说明意思怎样变化。