کانون چیزی یا فعالیتی بودن
مرکز چیزی یا فعالیتی بودن
a place or situation where a lot of a particular activity, especially an unwanted or unpleasant activity, is happening or might happen:
The police department was a hotbed of corruption.
In the 60s the city was a hotbed of crime.
مرکز چیزی یا فعالیتی بودن