翻译句子

Now NASA says it had to regroup and perhaps consider sending up a replacement part which could require additional training for the astronauts as on top of almost two years of training they've already undergone to make a series of upgrades the 18-year-old space telescope

现在NASA宣称它不得不重组，或许要考虑发射一个替代部分，这个替代部分需要宇航员在他们近两年的训练基础上进行额外的训练，目地是为这个已有18年的空间望远镜进行一系列的升级。