[译] 尽管那座桥已用了五十多年了，但仍然维修良好。
[误] Although the bridge has been used for more than fifty years, it is still in a good repair.

[正] Although the bridge has been used for more than fifty years, it is still in good repair.
[注] in good repair 表示“维修良好”。在这个词组中，repair 是不可数名词，表示“维修状况”，前面不能用不定冠词修饰。以及在 in bad repair (失修)，out of repair (失修)等词组中，repair 也是同样的意思。