outreach
加入词篮stretch
flex
zigzag
compressor
compression
shrink
magnet
magnetic field
magnetism
electric circuit
circuit board
circuit-breaker
circuitry
integrated circuit
integration
optics
light
ray
X-ray
ultraviolet ray
ultraviolet
infrared ray
infrared
reflection
reflector
refraction
refract prism
diffraction
laser
laser printer
laser beam
photon
HP
spectrum
spectroscopy
spectroscope
spectrometer
convex mirror
concave mirror
real image
virtual image
spectrometer
focus
focusing
focal point
focal length
oscillation
oscillator
vibration
quake
resonance
interference
acoustics
echo
reverberation
wave
wavelength
amplitude
frequency
period
sound wave
shock wave
airwaves
microwave
short wave
short-wave
ultrasound
ultrasonics
sonar
radar
electric charge
negative terminal
positive terminal
electric field
potential
repulsion
electric current
alternating current
direct current
ampere
voltage
capacitance
resistivity
resistance
fuse
transformer
volt
kilowatt
watt
conductor
conduction
conductivity
semiconductor
pressure
stress
friction
strain
mass
inertia
