reduced data record
简缩数据记录，约化数据记录

• straightness of line of sight
• straight reciprocating motion
• straight roller bearing
• straight scale
• straight slit
• straight-teeth bevel gear
• straight-teeth gear
• straight-tube telescope
• straight up-and-down filament
• strain
• strainer
• strain-free objective
• strain-ga(u)ge
• strainmeter
• strain-optical coefficient
• strain tensor
• strain viewer
• strand
• strangeness
• strap
• strata
• stratification
• stratified fiber
• stratified medium
• stratigram