Good morning/afternoon/evening lady(ies) and gentalmen(man), my name is XXX, and I am the manager of this restaurant.
Our specialty today is .....,
Please take your time for checking the menu, and you may want to wave your hand when you are ready to order.
Enjoy your meal.
请考虑采纳。
答：肯定是不合法的。 任何个人和机关（公安部门除外），都无权扣留身份证。 你可以向当地派出所求助。详情>>
