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loudspeaker loudspeaker /laυd|spikə/ noun an
electromagnetic device that converts
electrical signals into audible noise.
Also called speaker
lounge lounge /laυnd"/ noun  VIP lounge a
special room at an airport for VIPs.

departure lounge
louvre louvre /luvə/ noun thin, horizontal
openings for air cooling
Cold air can
be let into the cabin through adjustable
louvres. (NOTE: The US spelling is louver.)
low low /ləυ/ adjective 1. not high, not tall

a low building  low cloud cloud relatively
near the surface of the earth 
low ground an area of land which is not
high, as opposed to mountains 2. not
high, or below normal
an area of low
pressure  low temperature a temperature
which shows that it is cold 3. quiet,
not loud  noun an area of low atmospheric
pressure  polar low an area of
low atmospheric pressure over polar
regions
lower lower /laυə/ adjective 1. referring to
something that is at a low level or
towards the bottom
the lower layers of
the atmosphere  the lower surface of
the wing the underneath surface of the
wing 2. referring to something which is
below something else of the same sort

Air is cooler high up than at lower levels.
Opposite upper  verb 1. to let
down to a lower position  lower the
undercarriage move the undercarriage
into position ready for landing  lower
the flaps set the flaps to a down position
2. to reduce in amount or intensity
 to lower the temperature to reduce
the temperature  to lower the pressure
to decrease the pressure  to lower
141 luggage
the volume (of sound) to make something
such as a radio quieter or less loud
airspace lower airspace /ləυə eəspes/
noun the airspace below FL245
(approximately 24,500 ft)
lower atmosphere lower atmosphere /ləυə
tməsfə/ noun the layer of the
atmosphere in which changes in the
weather take place. Also called troposphere
low frequency low frequency /ləυ frikwənsi/,
low frequency band /ləυ frikwənsi
bnd/ noun a radio communications
range of frequencies between 30–300
kHz. Abbreviation LF
lubricate lubricate /lubrket/ verb to oil or to
grease moving parts in order to reduce
friction
Oil passes through the hollow
crankshaft to lubricate the big-end
bearings.
Turbo chargers are lubricated
by the engine oil system.
lubrication lubrication /lubr|keʃ(ə)n/ noun
the act or process of covering moving
surfaces with oil or grease in order to
reduce friction  lubrication system
the tank, pipes, pumps, filters, etc.,
which together supply oil to moving
parts of the engine
luggage luggage /l$d"/ noun baggage, i.e.
cases and bags that somebody takes
when travelling
M
mm1 abbreviation metre
mm2 abbreviation minute
Mach Mach /mk/ noun the ratio of the
speed of an object to the speed of sound
in the same atmospheric conditions

Mach 2 equals twice the speed of sound.
COMMENT: Named after E. Mach, the
Austrian physicist who died in 1916.
machine machine /mə|ʃin/ noun a device
with fixed and moving parts that takes
mechanical energy and uses it to do useful
work
A drill is a machine for making
holes in things.
An electrical circuit
is designed to carry energy to a
particular device or machine which can
then perform useful work.
Machmeter Machmeter /mkmitə/ noun an
instrument for measuring the Mach
number of an aircraft
Mach number Mach number /mk/ noun a number
that expresses the ratio of the speed of
an object to the speed of sound
magnesium magnesium /m$|niziəm/ noun a
light, silvery-white metallic element
that burns with a brilliant white flame.
Symbol Mg (NOTE: The atomic number
of magnesium is 12.)
magnesium flare magnesium flare /m$|niziəm
fleə/ noun a device for distress signalling
at night
to send off magnesium
flares
magnet magnet /m$nt/ noun an object
that produces a magnetic field, and
attracts iron and steel
Magnetism in a
magnet appears to be concentrated at
two points called the poles.
magnetic magnetic /m$|netk/ adjective
referring to or having the power of a
magnet or something with a magnetic
field
A freely suspended magnet – not
influenced by outside forces – will align
　
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本文鏈接地址：Dictionary of Aviation下(9)