| |||
looking-glass | |||
sight class; optical viewer; prism window | |||
peep hole | |||
glass wall | |||
sight port; sight glass window | |||
observation window | |||
sight glass; window | |||
viewing window | |||
sight flow glass | |||
porthole; viewing port | |||
glass | |||
inspection window; observation panel; sight window; vision light | |||
| |||
glass; window | |||
| |||
inspection window | |||
| |||
inspection port | |||
| |||
sighting port | |||
| |||
viewing window |
观察窗: 34 phrases in 13 subjects |
Automobiles | 3 |
Aviation | 4 |
Chemistry | 1 |
Drilling | 1 |
Electronics | 2 |
Metallurgy | 2 |
Oil / petroleum | 3 |
Rail transport | 2 |
Refrigeration | 2 |
Space | 2 |
Submarines | 1 |
Technology | 8 |
Wind Energy | 3 |