upper tropospheric perturbation

upper ridge (upper-level ridge)

upper trough (upper-level trough)

upper-air chart (upper-level charty)

water diversion from the upper Yangtze River in the south to the upper Yellow River in the north

perturbation and observation method with changing perturbation step

1221 upper working face

2×2 Upper Triangular Operator Matrixes

3-D upper-limb forces

95% Upper confidence limit

a landslide dam located in the upper-reach of Yell

Aberdeen Upper Reservoir

accepted upper limit

Accommodation above the Upper Deck

accurate upper bound solution

Acquired absence of both upper limbs [any level]

Acquired absence of upper limb above wrist

actual upper bound

Acute bacterial upper respiratory tract infection