a three-legged kettle, a tripod kettle, used for cooking and later for ceremonial purposes in ancient China, and often made of bronze / one of the I Ching hexagrams

a fall / a decline, a deterioration

scouting; reconnaissance

scout; spy upon; reconnoiter

theorem / (sciences) principle; rule

to propose / to suggest

imperial throne

imperial capital / Tokyo, the capital of Imperial Japan

apprentice

Kyūjitai form of 黄帝 (“(Chinese mythology) the Yellow Emperor (legendary Chinese sovereign)”)