◆descend v. 下落，降临(come or go down，书面用语)

Eg: darkness descends very soon because winter is coming.

v. descend from 遗传，传下(pass from father to son; be inherited by sb from sb)

Eg: The watch descended from his grandfather.

descend on / upon 突然袭击，突然访问(attack sb/ sth suddenly; visit sb/ sth unexpectedly)

Eg: The police descended on their hide-out. 警察突然袭击了他们的藏身处。

Yesterday, my best friend descended on me.

反义词：ascend 攀登，上升 Eg: The airplane is ascending at tremendous speed.

◆obstinately adv. 固执地，顽固地(toughly; stiffly)

obstinate adj. 顽固而不易被别人所改变

Eg: If you are an obstinate person, nobody can change your mind.