Recently the libration points in the sun-earth system have been the focus of various studies, and to research these special points will be meaningful for deep space exploration.是什么意思_Recently the libration points in the sun-earth system have been the focus of various studies, and to research these special points will be meaningful for deep space exploration.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句