曹老师您好，下句中句末when状语从句中的ship to....该如何理解？我看ship表示运送货物大多是及物动词，不及物动词的释义是“to be sent for delivery”，那这里感觉有些逻辑不通。

Until now, many sellers that have a physical presence in only a single state or a few states have been able to avoid charging sales taxes when they ship to addresses outside those states.