成人坐火车英文怎么说呢

"成人坐火车" 的英文表达方法有两种：

"take the train as an adult" 或 "ride the train as an adult"：
例句：
"I need to buy a ticket to take the train as an adult."
"Do you have a discount for senior citizens who ride the train as adults?"
"travel by train as an adult"：
例句：
"I prefer to travel by train as an adult because it's more comfortable than driving."
"How long will it take to travel by train as an adult from New York to Boston?"

这些表达方法的来源是英语的基本语法和常用词汇。"Take" 和 "ride" 都是动词，意思是 "坐" 或 "乘坐"，可以用来表示坐火车。"Travel" 也是一个动词，意思是 "旅行"，可以用来表示乘坐火车旅行。"As an adult" 是一个短语，意思是 "作为一个成年人"，可以用来区分成人和儿童。

中文翻译：

"I need to buy a ticket to take the train as an adult."："我需要买一张票坐火车（作为成年人）。"
"Do you have a discount for senior citizens who ride the train as adults?"："你们有针对乘坐火车（作为成年人）的老年人的折扣吗？"
"I prefer to travel by train as an adult because it's more comfortable than driving."："我更喜欢乘坐火车（作为成年人），因为它比开车更舒服。"
"How long will it take to travel by train as an adult from New York to Boston?"："从纽约到波士顿乘坐火车（作为成年人）要多长时间？"