When The President Goes Out To Eat, Who Pays For The Food?
总统出门吃饭，谁付钱？
I worked for a President (several actually). In the case of George H.W. Bush (41):
我曾经几次过服侍过总统，比如第四十一任的小布什。
When he went to his favourite Chinese Restaurant, Peking Gourmet Inn, Falls Church, Virginia. He always met other family members there.
他最中意的一家中餐厅位于弗吉尼亚州Fall Church，叫北京珍馐假日酒店，他经常和家人在那里聚餐。

They sat at a special table behind a “Chinese” wooden screen. The Secret Service advised the owners specifically how to change the window to bullet-proof glass.
他们经常坐在一面具有中国特色的木质屏风后面。情报局还曾特意建议店主，教他把屏风玻璃换成防弹玻璃。
The President always paid - I am not sure of the legalities of the restaurant giving a “free meal” but there are some.
总统一般都会自己付钱，我也不能确定有些餐馆主会给他免单，虽然这样的情况确有发生。