The first all-metal monoplane, designed by Hanna Reissner of Germany, which first flew in 1912, had wings of pure aluminum.是什么意思_The first all-metal monoplane, designed by Hanna Reissner of Germany, which first flew in 1912, had wings of pure aluminum.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句