Paying customers on commercially run flights to space would have to meet security requirements, but would not have to pass specific medical tests, according to draft U.S. Regulations.是什么意思_Paying customers on commercially run flights to space would have to meet security requirements, but would not have to pass specific medical tests, according to draft U.S. Regulations.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句