1.   The node will be the connecting passageway to other station elements.

2.   Aboard Endeavour is the second station component, an American-made connecting passageway named Unity.

3.   Aboard Endeavour is an American-made connecting passageway named Unity.

4.   The U.S. piece, named Unity, is a connecting passageway.

5.   This connecting passageway, the second link in the outpost, will be launched aboard shuttle Endeavour and attached to a Russian-launched control module.

6.   Unity will serve as a connecting passageway once more modules arrive over the next few years.

7.   Unity, a connecting passageway, needs the solar power generated by the Zarya control module to survive.

8.   Unity, the first American-made piece of the space station, will serve as a connecting passageway once more modules arrive over the next few years.