low-pres·sure /ˈloˈprɛʃɚ/
  (a.)低壓的,悠然自得的
  Low-pres·sure a.
  1. Having, employing, or exerting, a low degree of pressure.
  Low-pressure steam engine, a steam engine in which low steam is used; often applied to a condensing engine even when steam at high pressure is used. See Steam engine.
  ◄ ►
  low-pressure
       adj : not forceful; "a low-pressure salesman"; "a low-pressure
             campaign"