normal cross section
横断面，正剖面，正截面

• stationary wave absorption measurement
• statistical analysis
• statistical brightness gain
• helical rack
• helical scanning
• helical spur gear
• helical worm gear
• helical xenon-arc lamp
• helicity
• helicl gear
• helicoidal single material fibre
• heliconid
• helicopter fire control laser system
• heliocentric parallax
• heliochrome
• heliochromy
• helioctron
• heliograph
• heliography
• heliogravure
• heliometer
• helioscope
• helioscopic ocular
• heliosphere
• heliostat