serve a second master

(impersonal) get dark, for night to fall / for the season to end / be overwhelmed in an emotion, be lost in thought

incense (A perfume often used in the rites of various religions)

reigning

to reign, to dominate

(linguistics) kun'yomi: a reading of a kanji that is not derived from the kanji's original pronunciation borrowed from Chinese

to use the kun'yomi of a word, to read a kanji using the pronunciation of a native Japanese word

the Paleogene period

Inner Mongolia (an autonomous region of China)

Outer Mongolia