装置: Installation

arrogant

相互: mutual, reciprocal

That was unexpected. I didn't see that coming.

珪藻: diatom

双角錐: dipyramid, bipyramid

双円錐: bicone, dicone

a combat sport match where opponents compete against each other using different styles of martial arts

(military) siege (military blockade of settlement)

丑三つ時: (archaic) the time between and 2:00 AM and 2:30 AM, or between 3:00 AM and 3:30 AM; (archaic, poetic, by extension) the middle of the night, late night