Once the fleet is grounded, America will for a while have no means of its own to deliver men and women to any part of space.
而一旦航天飞机停飞，美国在一段时间内就没有其他途径将人带往太空。
One proposal is for a fleet of ships that would spray seawater into the sky that would leave behind salt crystals to brighten clouds, reflecting more sunlight back into space.
一个建议是由舰队把海水喷向空中，这样会留下盐晶体来照亮云层，从而将会把更多的阳光反射回大气。
This flight is one of the last scheduled for the space shuttle fleet.
这次“发现号”飞行是太空梭机群仅剩几次飞行中的一次。
The original plan called for building a shuttle fleet and an orbiting space station at the same time.
原计划要求建立一航天飞机机群以及同时建一个轨道空间站。
The original plan called for building a shuttle fleet and an orbiting space station at the same time.
原计划要求建立一航天飞机机群以及同时建一个轨道空间站。
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