1. doorway
2. gateway

1. pass
2. gateway
3. (fig.) juncture

1. bridgehead (military)
2. stronghold serving as a base for advancing further into enemy territory
3. bridge tower (ornamental structure at either end of a bridge)
4. (fig.) gateway (place that provides access to other places beyond it)
5. bridgehead (key location serving as a base for further expansion)

1. gate
2. door
3. gateway
4. doorway
5. opening
6. valve
7. switch
8. way to do something
9. knack
10. family
11. house
12. (religious) sect
13. school (of thought)
14. class
15. category
16. phylum or division (taxonomy)
17. classifier for large guns
18. classifier for lessons, subjects, branches of technology
19. (suffix) -gate (i.e. scandal; derived from Watergate)

classifiers: 扇, 個

1. open sluice gate
2. (toll) station
3. boarding gate (airport etc)
4. (fig.) gateway (access point)