工学 食品安全 释 food safety objective；FSO 食品安全目标 食品中的某种危害可提供或促进适当保护水平（appropriate level of protection，ALOP）的最大允许频率或浓度。食品安全目标的概念仅限于食品安全，不涉及质量。
网络与数据通信 无线网络 释文 free space optics, FSO 自由空间光束
- principalization
- principal lattice element
- principal leadership
- principal left ideal
- principal left ideal ring
- principal line
- principal line of photograph
- principally analytic set
- principally polarized variety
- principal mapping
- principal matrix
- principal maximum
- principal measure
- principal minimum
- principal minor
- principal minor array
- principal minor determinant
- principal module
- principal moment
- principal moment of inertia
- principal net of a mapping
- principal net of the flow
- principal neutral point
- principal nilpotent orbit
- principal norm