Express a change in situation; 'then', 'in that case', 'so'.
Long explanation:
The A。それでは、~B。grammar point is used to express a change in situation or transition from one action to another. It can be translated as 'then', 'in that case', or 'so' in English. The formation consists of two sentences or clauses, with それでは connecting them and reflecting a change based on the previous statement (A).