Velocity fluctuations in the Lagrangian frame have been observed by using a double-theodolite system to track balanced balloons released at the height of 160m of the 325m tower which is located on the north suburb of Beijing.是什么意思_Velocity fluctuations in the Lagrangian frame have been observed by using a double-theodolite system to track balanced balloons released at the height of 160m of the 325m tower which is located on the north suburb of Beijing.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句