这种东西你最好看一下英英字典。别看英汉
a person who receives or entertains other people as guests.这个是接待员的意思,很明显,西部世界世界里的host主要是用来招待顾客的,翻译成接待员相当合理。
a computer that mediates multiple access to databases mounted on it or provides other services to a computer network. 这是你发的 “主机”的意思。我觉得英英的内容,并不能用来形容西部世界里的host
还有一个定义,但不清楚是不是官方的:A host is an artificial creation designed to mimic a human being. They are used in the Westworld park as part of storylines, or narratives. They are there for the guests' entertainment. 这个很明显是接待员的意思。
最后host 和 guest对应。接待员和游客。翻译的没什么问题