The traveling environment system was an open system.It is unceasingly exchanging material and energy with the outside.It is impossible to achieve the absolute balance.是什么意思_The traveling environment system was an open system.It is unceasingly exchanging material and energy with the outside.It is impossible to achieve the absolute balance.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句