快速答案
fila 指排队等候的队伍；linha 指几何线、文字行、交通线路或产品线。
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
fila
queue
Use fila for people, vehicles, or items waiting one behind another.
linha
line
Use linha for a drawn line, route, product range, or other linear connection.
如何选择
- fila: Choose fila if the sentence points to people, vehicles, or items waiting one behind another.
- linha: Choose linha if the sentence points to a drawn line, route, product range, or other linear connection.
例句
A fila do banco está longa.
The line at the bank is long.
Trace uma linha no papel.
Draw a line on the paper.
常见误区
For people waiting in Brazil, use fila. Linha can describe their arrangement, but it does not normally name the queue service.
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 fila，一次用 linha。如果两个版本都可以，说明意思怎样变化。