in relation to 与…有关;
[例句]He is the sixth person to be arrested in relation to the coup plot.
他是政变阴谋牵涉到的第6个被捕的人。
with regard to 关于; 就; 说起;
[例句]Until now, the government has only enforced the ban with regard to American ships
到目前为止,政府仅仅对美国船只实施了禁令。