The inner part of the propellant tank is one ultra thin TB8 spherical part which is made of two hemispherical parts by welding technique.是什么意思_The inner part of the propellant tank is one ultra thin TB8 spherical part which is made of two hemispherical parts by welding technique.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句