___________________________________NASA said a low temperature firing of the 54 meter-long booster known as the space launch system performed flawlessly. It was anchored horizontally for the test carried out in Utah. ___________________________________美国航空航天局称在低温下点燃这个54米长的(太空发射系统)助推器没有出现任何差错.这个助推器已被水平安置在犹他州以供试验.
