时间:2011-02-23 15:20来源:蓝天飞行翻译 作者:航空 点击:次
a rectangle OBS abbreviation omni-bearing selec-tor obscure /.bskjυ./ adjective not clearly understood . the explanation was obscure the explanation was diffi-cult to understand because it wasn’t clear . verb to make difficult to see . Deposits of ice crystals on the wind-screen will obscure vision. obscured /.bskjυ.d/ adjective . sky obscured a meteorological term to mean that fog or mist prevents sight of the sky observation /.bz.ve..(.)n/ noun careful watching . The type of cloud is established by observation and com-parison with cloud photographs. observe /.bzv/ verb to watch care-fully . Local wave action can be observed from a height of 200 feet. . Wing deflection can be observed from the passenger cabin. observer /.bzv./ noun a person working in a meteorological station who assesses weather conditions by vis-ual means . Meteorological visibility is the greatest horizontal distance at which objects can be seen and recog-nised by an observer on the ground with normal eyesight and under conditions of normal daylight illumination. obstacle /.bst.k(.)l/ noun some-thing which blocks a path or prevents progress . Low frequency transmissions can penetrate obstacles such as moun-tains. . Knowing the heights of obsta-cles en route, it must be ensured that in the event of an emergency, the flight may be continued in safety. obstacle clearance /.bst.k(.)l obtain 160 obtain /.bte.n/ verb to acquire, to get |