11.   The air lock allows American space station astronauts to conduct spacewalks in their own suits.

12.   That chamber will allow station astronauts to conduct spacewalks without the aid of a shuttle.

13.   The air lock, a two-room pressure chamber, will enable station astronauts to conduct spacewalks in U.S.-made spacesuits without aid of a shuttle.

14.   The astronauts will conduct experiments into the behavior of flames in weightlessness.

15.   The chamber will enable station astronauts to conduct spacewalks without aid of a space shuttle.

16.   The new arm will install a pressure chamber to Alpha in June that will allow station astronauts to conduct spacewalks without the aid of a shuttle.

17.   The shuttle astronauts must conduct three spacewalks to hook up the solar wings and install other equipment before all the hatches can be opened.

18.   The shuttle astronauts conducted four spacewalks to hook up the beam.

19.   The shuttle astronauts will conduct three spacewalks to hook up the solar wings and attach other equipment to the space station.

20.   The U.S.-built air lock, a pressurized chamber, will allow station astronauts to conduct spacewalks in U.S.-made spacesuits without aid of a shuttle.