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
- elementary integral
- elementary interval
- elementary kernel
- elementary Kleinian group
- elementary length
- elementary logic
- elementary mathematics
- elementary matrix
- elementary matrix operation
- elementary measure
- elementary method
- elementary method of integration
- elementary mode analysis，EMA
- elementary net system
- elementary notion
- elementary number
- elementary number theory
- Elementary on Astronomy
- elementary operation
- elementary operations on matrices
- elementary operator
- elementary partical physics
- elementary particle
- elementary particle physics
- elementary particles