That is why the results of three German expeditions by the vessel Polarstern to the Weddell Sea, published in the current issue of Nature, are a big step forward.是什么意思_That is why the results of three German expeditions by the vessel Polarstern to the Weddell Sea, published in the current issue of Nature, are a big step forward.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句