"剧场正厅座位" can be translated as "stalls seats (in a theater)" or simply "stall seats".
In this context, "stalls" refers to the main seating area in a theater, typically located on the ground floor and closest to the stage. It's a common term used in British English, while in American English, you might more often hear "orchestra seats" for a similar area, though "orchestra" here refers to the seating location rather than the musicians. However, "stall seats" is a widely understood and accepted term across English-speaking regions for referring to this particular seating area in a theater.