快速答案
manter 维持状态或运作；preservar 保护事物免受损坏或丢失。
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
manter
to maintain or keep
Use manter for continuing a state, routine, possession, or operating condition.
preservar
to preserve or protect
Use preservar for shielding something valuable from damage, loss, or unwanted change.
如何选择
- manter: Choose manter if the sentence points to continuing a state, routine, possession, or operating condition.
- preservar: Choose preservar if the sentence points to shielding something valuable from damage, loss, or unwanted change.
例句
A equipe manteve o serviço ativo.
The team kept the service running.
O projeto busca preservar a mata nativa.
The project seeks to preserve the native forest.
常见误区
You can manter a system without preserving its original form. Preservar adds a protective purpose.
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 manter，一次用 preservar。如果两个版本都可以，说明意思怎样变化。