测风气球观测
pilot balloon observation
pilot-balloon observation
pibal
气球观测塔
meteorological observational tower
半圆柱形边墩
semicircle cylindrical pier
半圆柱形反射器
semicylindrical reflector
semi-cylindrical reflector
半圆柱形量水槽
semi-cylinder measuring-flume
半圆柱形凸起
gibbous surface of the half-columniform conductor
保形圆柱投影
conformal cylindrical projection
变截面圆柱形空腔
varying sectional cylindrical cavity
粗齿圆柱形铣刀
cylindric milling cutter with coarse teeth
弹性圆柱形薄壳
elastic cylindrical thin shell