老鼠出入频繁怎么说英语

In English, you can say that mice are frequently coming and going if they are entering and exiting a place frequently. You could also say that the mice are very active, or that there is a lot of mouse activity in a particular area. For example:
"I've noticed that mice seem to be coming and going from the pantry a lot lately. I think we have a problem with pests."
"There's been a lot of mouse activity in the garage lately. I think we need to do something to keep them out."
"The mice in this house are very active. I see them scurrying around all the time."