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the most important but often simplest
part of something, from which everything
else is derived
This chapter provides
a basic understanding from which
the study of meteorology can develop. 
basic principle a central or fundamental
idea or theory
basic area navigation basic area navigation /besk
eəriə nv|$eʃ(ə)n/ noun a standard
of performance for navigation that
requires an aircraft to remain within 5
nautical miles of the centreline of its
course for 95% of the time
basis basis /bess/ noun the central and
most important part of something from
which everything else is derived
The
basis of air navigation is the triangle of
velocities. (NOTE: The plural form is
bases.)
bat bat /bt/ noun an object shaped like a
table-tennis bat used by a person on the
ground to guide an aircraft when it is
taxiing or parking
batsman batsman /btsmən/ noun somebody
who uses a pair of bats to guide an
aircraft when it is taxiing or parking
battery battery /bt(ə)ri/ noun a chemical
device that produces electrical current

This piece of equipment is powered by 2
batteries.
charger
bay bay /be/ noun 1. a space or area in the
structure of an aeroplane where equipment
can be located
To avoid damage
to the wheel bay, the nose wheel must be
31 beware
aligned in a fore and aft direction during
retraction. 2. a part of the coast that
curves inwards
the Bay of Bengal
bayonet fitting bayonet fitting /beənt ftŋ/
noun a means of attaching something to
something, in which an object with two
side pins is inserted into a L-shaped slot
in another object on some light-bulbs

Magnetic chip detectors are of the bayonet
type fitting and can be removed
and replaced very quickly.
beacon beacon /bikən/ noun a light or radio
signal for navigational purposes
If the
aircraft turns towards the beacon, signal
strength will increase.
beam beam /bim/ noun 1. a long thick
metal bar used as a support
A beam is
designed with a breaking load of 12
tons but when a three ton load is
applied repeatedly, the beam may fail.
2. a shaft of light or radiation travelling
in one direction, as from a car’s headlights

The electron gun produces a
stream of fast-moving electrons and
focuses them into a narrow beam.
beam sharpening beam sharpening /bim
ʃɑpənŋ/ noun the process of making
a radio or light beam narrower
Any
system employing beam sharpening is
vulnerable to side lobe generation at
the transmitter.
bear bear /beə/ verb 1. to carry or to hold

The undercarriage has to bear the
weight of the aircraft on the ground. 
rain-bearing cloud a cloud carrying
moisture which can fall as rain 2.  to
bear something in mind to keep in
mind  it should be borne in mind it
should be remembered  bearing in
mind considering
Bearing in mind
that she hadn’t flown for three weeks,
the student pilot’s landings were very
good. 3. to be able to deal with something
without becoming distressed or
annoyed
He can’t bear the noise.
(NOTE: bearing – bore – borne)  he
can’t bear the heat the heat is too
much for him
bearing bearing /beərŋ/ noun 1. the angle,
measured in a clockwise direction, of a
distant point, relative to a reference
direction
To plot a position line from
the non-directional radio beacon, it is
first necessary to convert the relative
bearing to a true bearing and then calculate
the reciprocal. 2. a device containing
steel balls or needles which
allows free rotation of one component
around another
Beaufort scale Beaufort scale /bəυfət skel/ noun
scale from 1–12 used to refer to the
strength of wind
Wind speeds can be
estimated by using the Beaufort scale of
wind force.
belly flop belly flop /beli flɒp/ noun same as
belly landing
belly landing belly landing /beli lndŋ/ noun
an emergency landing of an aircraft
when the wheels have not come down
belt belt /belt/ noun 1. a long, relatively
narrow area  high-pressure belt long
narrow area of high pressure  precipitation
belt a long narrow area of rain,
snow or hail  rain belt long narrow
area where rain falls
The cirrus cloud
can be 900 miles ahead of the surface
　
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本文鏈接地址：Dictionary of Aviation上(30)