In April 1961, Russian cosmonaut Yuri Gagarin marked the first chapter in manned space flights in human history by becoming the first man to orbit the Earth for seven days.是什么意思_In April 1961, Russian cosmonaut Yuri Gagarin marked the first chapter in manned space flights in human history by becoming the first man to orbit the Earth for seven days.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句