背向: disobeying and obeying / 背甲: the shell of a turtle or tortoise / 廃坑, 廃鉱: an abandoned mine / 配光: the distribution of light around a room

廃坑, 廃鉱: to abandon a mine / 廃校: to close a school / 廃興: to fall and rise

灰原: a surname

配信: transmission, distribution

排外: anti-foreign, xenophobic / 灰貝: a blood cockle

配偶子: gamete

insight / penetration (of a problem)

to have an insight / to penetrate a problem

falling in (like a cave in), collapse

to fall in, to cave in