进入水面下活动

lack, be deficient, be short of

potential, latent

IOU, certificate of indebtedness

指人的思想、行为、性格等在不知不觉中受到影响而变化

to choke (because of swallowing the wrong way), to irritate the nose, to choke (of smoke, smell etc), pungent, (coll.) (Tw) to shout at sb, to scold, to speak out against sb