时间：2011-02-23 15:20来源：蓝天飞行翻译 作者：航空 点击：次
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. Point the aircraft towards the airfield. 2. to indicate direction, often with a fin-ger . point to the east 3. . to point out to draw attention to . The instructor pointed out the dangers of not keeping a good lookout. pointer /p..nt./ noun an indicating device on an instrument, e.g. a needle . The pointer centralises to indicate that the aircraft is aligned with the runway centre line. point of no return /p..nt .v n.υ r. tn/ noun a place on the route where the aircraft does not have enough fuel to return to the starting place . The point of no return is calculated before depar-ture to cover the chance that both the terminal airfield and its alternate become unavailable during flight. Abbreviation PNR polar /p.υl./ adjective 1. located in or coming from the region around the north or south pole . polar air . a polar region . The greatest horizontal gradi-ents of mean temperatures of a layer are found at the boundaries between cold polar and warm tropical air masses. 2. referring to the pole or poles of an elec-trical device or of a magnet . Bar mag-nets attract each other because of polar differences. polar diameter /p.υl. da.m.t./ noun the distance from one pole, pass-ing through the centre of the Earth, to the other pole . The Earth’s polar diameter is shorter than its average equatorial diameter. polar ice cap /p.υl. a.s kp/ noun the permanent area of ice at north or south pole polarisation /p.υl.ra.ze..(.)n/, polarization noun 1. a characteristic of light or radio or other electromagnetic waves in which the waves are aligned in one direction and show different prop-erties in different directions . The antenna must have the same effective length and the same polarisation as the transmitter. 2. partial or complete polar separation of positive and negative elec-tric charge polarise /p.υl.ra.z/, polarize verb 1. to align in one plane . The frequency allocation for VOR (very high fre-quency omni-directional radio range) is 108–117.975 MHz (megahertz) and transmissions are horizontally polar-ised. 2. to separate positive and negative electric charges polarity /p.υlr.ti/ noun the direc-tion of flow of flux or current in an object . During discharge, when the pole 174 |
