理论计算机科学 可计算性与计算复杂性 释文 Walsh-Hadamard code 沃尔什-阿达马编码
- umbral dot
- umbral eclipse
- umbral flash
- umbral index
- umbral notation
- umbral operator
- umbral shift
- umbrella
- umbrella anchor winch
- umbrella clause
- umbrella effect
- umbrella fern
- umbrella fern family
- umbrella ferns
- umbrella graph
- umbrella hydro-generator
- umbrella pine family
- umbrella sampling
- umbrella species
- Umbrians
- umbric epipedon
- Umbriel
- Umeda Hiroaki
- Umehara Ryūzaburō
- Ume Kenjiro