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Kepler derived the laws which relate to
the motion of planets in their orbits.
relation relation /r|leʃ(ə)n/ noun 1. a natural
or logical association between things

the relation between thrust and drag 
this bears no relation to that this is not
connected with that in any way 2.  in
relation to with reference to
The
range at which objects can be recognised
is affected by the direction of
viewing in relation to the position of the
sun or the moon.
The VOR station on
the ground does the calculation and,
depending on where the aircraft is in
relation to the VOR station, it will
receive signals which define the bearing
of the aircraft from the VOR.
relationship relationship /r|leʃ(ə)nʃp/ noun a
natural or logical association between
things
There is a close relationship
between altitude and pressure.
relative relative /relətv/ adjective  relative
to compared to, with reference to

Ground-speed is the speed of the aircraft
relative to the ground.
relative airflow relative airflow /relətv eəfləυ/
noun airflow over an aerofoil, often
related to the chord line of the aerofoil.
Also called relative wind
relative bearing relative bearing /relətv beərŋ/
noun the bearing of a radio station or
relative density 192
object with reference to the aircraft’s
heading
relative density relative density /relətv densti/
noun the ratio of density of a liquid with
reference to water, or of a gas with reference
to air
relative humidity relative humidity /relətv hju|
mdti/ noun the ratio between the
amount of water vapour in the air and
the amount which would be present if
the air was saturated, at the same temperature
and the same pressure
relative wind relative wind /relətv wnd/ noun
same as relative airflow
relay relay /rile/ noun a device which
responds to a small current or voltage
change by activating switches or other
devices in an electric circuit
Thermocouple
detectors operate a sensitive
relay or electronic circuit when a predetermined
temperature is exceeded. 
verb to pass an ATC message to an aircraft
via another aircraft that is on the
same frequency and within radio range
(NOTE: Messages may have to be
relayed when atmospheric conditions
make a direct transmission impossible)
release release /r|lis/ noun the act of freeing
something from something that holds it

Air rising and cooling often reaches
its dew point temperature, becomes saturated
and any further cooling results
in condensation and the consequent
release of latent heat.  verb to free
from something that holds it
Push the
button to release the lever.  release the
brakes let the brakes off  to release
the pressure to allow pressure to
reduce
relevant relevant /reləv(ə)nt/ adjective having
a connection with the matter in hand

High charts show only information
relevant to high altitude flights and
many beacons and aids which are provided
for low operations are omitted to
keep the chart clear.  relevant information
useful information which is
related to the matter in question
reliability reliability /r|laə|blti/ noun
dependability, trustworthiness
The
gas turbine is a very simple engine with
few moving parts, giving it high reliability
with less maintenance.
‘…where a State introduces drug testing,
high standards of medical reliability must
be maintained’ [INTER PILOT]
reliable reliable /r|laəb(ə)l/ adjective
dependable, trustworthy
The gas turbine
is a very simple and reliable
engine.
relief relief /r|lif/ noun 1. variations in elevation
of the surface of the earth

Relief is usually represented on aeronautical
charts by contours, gradient
tints or hill shading. 2. a lessening of
pressure
relief valve relief valve /r|lif vlv/ noun a
valve which opens at maximum safe
pressure and closes again upon return to
normal operating conditions
relieve relieve /r|liv/ verb to cause a lessening
in, or to remove, excess pressure or
tension
Safety valves relieve excess
cabin pressure.
A trim tab on the elevator
relieves the forward and aft forces
on the control stick or yoke.
　
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本文鏈接地址：Dictionary of Aviation下(54)