不能直接用but also .但在这个句子中你可以把but删掉啊,这样就是正确的了. Airplanes are the fastest also the most expensive. 个人觉得你句尾应该加点什么,比如: Airplanes are the fastest but also the most expensive ways to travel. 搭乘飞机是最快的,也是最昂贵的旅行方式.
Airplanes are the fastest but also the most expensive. 解析:此句中的"but also"并不是固定结构"not only,...but also"结构,而是两个词,连词but和程度副词also,整句翻译为"飞机是最快的,但也是最昂贵的。" 望采纳哦,不懂可以追问哦~~~