淵

deep pool / deep / profound

abyss

erudite / profound / learned / extremely knowledgeable

Liu Yuan (c. 251-310), warlord at the end of the Western Jin dynasty 西晉|西晋[Xi1 Jin4], founder of Cheng Han of the Sixteen Kingdoms 成漢|成汉[Cheng2 Han4] (304-347)

Chidori ga fuchi, national war cemetery in Tokyo / also called Tomb of the Unknown Soldier

honest and far-seeing

distance between two poles / poles apart

a complete contrast / totally different

Obuchi (Japanese surname)

Obuchi Keizo (1937-2000), Japanese politician, prime minister 1998-2000

abyss

Li Yuan, personal name of first Tang emperor Gaozu 唐高祖[Tang2 Gao1 zu3] (566-635), reigned 618-626

vast and profound

deep valley

rich and variegated

broad and extensive (of knowledge etc)

profound thoughts or ideas

erudite but open-minded

deep springs

no less than from heaven to the abyss (idiom); differing widely / worlds apart / the gap couldn't be bigger

abyss / deep chasm