Based on the image, how were foreigners expected to behave when meeting Chinese Officials and why

Foreigners are expected to knee and now when meeting the Chinese officials

Explanation:

In respect of the picture attached, foreigners are expected to knee and now whenever they met with any Chinese officials.

This is in accordance to the chineses culture.

Bowing in the Chinese Culture doesn't only means greetings as it is widely considered.

It is also a sign of respect and also used when apologizing.

then its a law the end