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two-way communication cannot be
established but where it is believed that
the called station is able to receive the
transmission
block block /blɒk/ noun a large mass of
something  verb 1. to prevent something
such as a fluid from passing freely
through a pipe or channel
At high altitude,
any water condensing out of the
fuel could freeze and block the filters. 2.
to prevent a course of action
The government
blocked attempts to prevent the
building of the new airport.
blockage blockage /blɒkd"/ noun 1. a collection
of something blocking a pipe, narrow
channel, filter, etc.
Ice crystals
may form to cause a blockage of the fuel
filter. 2. the state of being blocked
The
blockage was caused by ice.
blow blow /bləυ/ noun 1. an impact
a blow
on the head 2. a disappointment
The
news of her failure in the examination
was a severe blow.  verb 1. (of the wind
or air) to move
The sea breeze may
blow almost parallel to the coast. 2. (of
33 boot
a fuse) to break, as it should, when the
circuit is overloaded (NOTE: blowing –
blew – blown)
blow-back blow-back /bləυ bk/ noun a sudden
movement of fluid in the opposite
direction to the general flow
A sudden
release of pressure may cause a blowback.
blower blower /bləυə/ noun a device for
blowing air
Air for combustion is
obtained from a blower.
board board /bɔd/ noun 1. a flat, square or
rectangular piece of wood or other
material 2.  on board on an aircraft

The flight plan records the callsign and
the number of people on board.  verb
to get on to an aircraft
In an emergency,
many passengers only remember
the entrance by which they boarded the
aircraft.
boarding gate boarding gate /bɔdŋ $et/ noun
the door through which passengers
leave the terminal building to get on to
an aircraft
Boarding gates 1 – 10 are
on the left.
boarding pass boarding pass /bɔdŋ pɑs/ noun
a temporary pass, issued at the check-in
desk, which allows the holder to board
the aircraft
Boarding passes must be
shown at the gate. (NOTE: The plural
form is boarding passes.)
boarding steps boarding steps /bɔdŋ steps/ plural
noun stairs used by passengers and
crew to get on board an aircraft
Passengers
had to wait in the aircraft for 15
minutes before the boarding steps were
put in position.
boarding time boarding time /bɔdŋ tam/ noun
the time when passengers are due to
board the aircraft
Boarding time is at
13.30 hrs.
body body /bɒdi/ noun 1. the whole of a
person or an animal 2. the main part of
a person, but not the arms or legs 3. the
main part of an aeroplane, system, text,
etc.
The body of an aircraft is also
called the ‘airframe’.
A flow-control
valve consists of a body and a floating
valve. 4. a large mass of liquid or gas 
body of air a large quantity of air
behaving in a particular way 5. an
object
Acceleration is the rate of
change of velocity of a body.
boil boil /bɔl/ verb to heat a liquid until it
reaches a temperature at which it
changes into gas
Water boils at
100°C.  boiling point the temperature
at which a liquid changes into gas
The
boiling point of water is 100°C.
bolt bolt /bəυlt/ noun 1. a metal rod with a
head, which screws into a nut
The two
halves of the wheel are held together by
bolts. 2.  bolt of lightning one electrical
discharge of lightning  verb to
attach with a bolt
Aircraft wheels are
constructed in two halves which are
bolted together.
bond bond /bɒnd/ noun the power that
holds surfaces together, when they are
joined using heat, cold, chemicals or
glue
The de-icing boot breaks the
bond between the ice and the outer skin.
 verb to join surfaces together normally
using heat, cold, chemicals or
glue
The skin is bonded to the internal
members by the redux process.
boom boom /bum/ noun in some aircraft, a
spar that connects the tail to the fuselage
boost boost /bust/ noun an increase or
improvement
The improvement in a
country’s economy often gives a boost
to the airline industry.  verb 1. to make
or to help something increase
An oil
pump boosts engine oil pressure. 2. to
increase
The instructor’s comments
boosted the student pilot’s confidence.
　
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本文鏈接地址：Dictionary of Aviation上(32)