汉译英:我认为乘火车旅行既安全又便宜.

i think travelling by train is safe and cheap.

I think travelling by train is both safe and cheap

I like to travel alone. First of all, I think there's more freedom when I go out by myself, I could go anywhere I want, it's all up to me alone. Secondly, travelling by oneself could help you release all your anxiety and pressure, as well as enjoy the pleasure of a lone journey. Last but not least, I could learn more about other people and things, understand the world better.
Though it could be a little lonely at times, or a littel unsafe, I still prefer to travel alone.

I think it is safe and cheap to travel by train

我认为乘火车旅行既安全又便宜.
I think the train trip to be both safe and cheap.

I think the train trip to be both safe and cheap.
我最擅长翻译了(*^__^*) 嘻嘻……