maser 1
由分子所放出的微波能放大器 maser 2
(microwave amplification by stimulated emission of radiation)
(1)微波激射
(2)微波激射器

• sector gear
• sectorial wave
• sector shaft
• sector shutter
• secular aberration
• secular equation
• sediment
• Seebeck effect
• seed crystal
• seeder
• seedholder
• seeding
• see-in-dark rangefinder
• seeking
• Seeman-Bohlim camera
• Seeman slit
• segmented glass laser
• segmented mirror
• segmented rod
• segmented rod laser
• segment gear
• segment shutter
• segregation
• Seidel aberrations
• Seidel coefficient of aberration