We ' ve just completed a round of testing our extraction equipment on the stardust interstellar flight spare tray ( a back - up tray manufactured for the stardust mission just in case something went wrong with the first tray before launch ) 我們剛在飛行備用件(一個(gè)備份的盤如果前一個(gè)在發(fā)射前出了問題就用它替換)上完成一輪對(duì)我們的提取設(shè)備的測(cè)試。