Read the following excerpt:
Moreover, in the middle of the city there is a great clock ‑‑ that is to say, a bell ‑‑ which is struck at night. And after it has struck three times no one must go out in the city, unless it be for the needs of a woman in labour, or of the sick. And those who go about on such errands are bound to carry lanterns with them. Moreover, the established guard at each gate of the city is 1,000 armed men; not that you are to imagine this guard is kept up for fear of any attack, but only as a guard of honour for the Sovereign, who resides there, and to prevent thieves from doing mischief in the town.
-Marco Polo’s description of Cambaluc
Then, using the excerpt as a source, answer the following question:
How large was the gap between Europe and China in societal advancement in the late Middle Ages?