"Room 518" is the way to say "房间号518" in Engpsh.

This phrase is derived from the way that hotel rooms and other types of rooms are ped and identified in Engpsh-speaking countries. In a hotel or other building, the number of a room is often preceded by the word "room" and followed by a hyphen or a space. For example, if a room is designated as "Room 518," it means that it is the fifth room on the first floor (or the eighteenth room if the building has more than ten floors).

Here are some examples of sentences using the phrase "Room 518" in Engpsh:

"I'm staying in Room 518 on the fifth floor." (我住在五楼的房间号518里。)
"Can you meet me in Room 518 at 2:00 PM?" (你能在下午2点来房间号518见我吗？)
"The key to Room 518 is missing. Can you help me find it?" (房间号518的钥匙丢了。你能帮我找到它吗？)