The man, who has not been identified, is believed to be the first person to survive a drop over the falls without any life jacket or flotation device.是什么意思_The man, who has not been identified, is believed to be the first person to survive a drop over the falls without any life jacket or flotation device.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句