スレッドを立てるまでもない質問スレッド Part 317

498 ：名無しさん＠英語勉強中：2015/12/07(月) 17:31:16.83 ID://sMb69f.net

But the probe will not be able to collect as much data as initially intended
because it will be circling the planet at a much higher altitude than envisioned under its originally planned orbit time of 30 hours, which it was unable to achieve in December 2010



30 hours, which it was unable to achieve in December 2010ですが
なんで30 hours, which was unable to achieve in December 2010じゃないんでしょうか？
あとitは何を指しているんでしょうか？