国际空间站的宇航员还可以另外储藏一些“个人爱好食品”，他们在轨道上每生活一个月就要消耗1立方英尺的储存空间。
ISS crew members also get to stash a few "preference items" away, enough to equal 1 cubic foot of storage space for every month they're in orbit.
这是一个只有18英尺的小型太阳帆，旨在增加大气阻力以帮助卫星脱离轨道。
These are only 18 feet on a side and designed to increase atmospheric drag and thus help satellites out of orbit.
隧道的最困难部分是57公里(35.4英里)的支线，它位于现在的Gotthardbahn轨道下方2000英尺(600米)以下的岩石中。
The most difficult portion of the tunnel is the 57 km (35.4 mi) stretch that will run nearly 2, 000 feet (600 meters) under the Gotthard massif below the existing Gotthardbahn track.
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