The offer probably would not have been made at all without Track II efforts.
如果没有“第二路径”的努力，可能根本不会有这样的成果。
I have to operate in unofficial "Track II" Settings where they are likely to be seriously constrained.
我不得不采用非官方的“第二路径”，通常受到严重的限制。
ICESat-II will launch in 2015. Until then, Dr. Markus will use what's called Ice Bridge - aircraft in flight over the polar regions - to measure and track changes.
ICESat - II将在2015年发射，到时候，马库斯博士会用所谓的冰桥——在极地上空飞行的航空器——去测量和跟踪冰层的变化。
ICESat-II will launch in 2015. Until then, Dr. Markus will use what's called Ice Bridge - aircraft in flight over the polar regions - to measure and track changes.
ICESat - II将在2015年发射，到时候，马库斯博士会用所谓的冰桥——在极地上空飞行的航空器——去测量和跟踪冰层的变化。
应用推荐