When two positional adverbials occur in a sentence, they enter into a hierarchical relationship, with the one denoting a larger place preceding the one denoting a smaller place, according to the Chinese conceptual Principle of ‘Whole- Before-Part’. The two positional adverbials may serve two different grammatical functions; one is used as a sentential adverbial, and the other as a predication adverbial.
Zài Beijīng hěnduō rén zài Quánjùdé Kǎoyādiàn chī kǎoyā.
(Many people eat roast duck at Quanjude restaurant in Beijing.)
* Zài Quánjùdé Kǎoyādiàn hěnduō rén zài Beijīng chī kǎoyā.
(*At Quanjude restaurant, many people in Beijing eat roast duck.)
The adverbial 在北京‘zài Beijīng’ (in Beijing), which denotes a larger scope than the adverbial 在全聚德烤鸭店‘zài Quánjùdé Kǎoyādiàn’ (at Duck Restaurant Quanjude) does, can function as a sentential adverbial occurring in the initial position of the sentence, while the latter adverbial cannot.
 Loar, J. K. (2011). Chinese syntactic grammar: functional and conceptual principles. New York: Peter Lang.