The travellers at the airport were searched at random.
2.at any rate 无论如何，至少
At any rate the task must be fulfilled.
3.by reason of 由于
By reason of his youth the boy escape punishment.
4.as regards 关于，至于
He regards the situation as very serious.
5.with/in regard to 对于，就……而论
In regard to his suggestions we shall discuss them fully