Therefore, 评注性状语

when a person from one of these cultures is speaking and suddenly stops, 时间状语从句

what may be implied 主语从句。what=the thing which

is 系词

that the person wants the listener to consider what has been said before continuing. 表语从句

译文：所以，来自这些文化背景之一的人在说话的时候突然停下来，可能意味着此人在继续说话之前希望听话人思考他所说过的话。