Usages of dek du
Mia oficejo estas sur la tria etaĝo, en ĉambro numero dek du.
My office is on the third floor, in room number twelve.
La lifto ne funkcias, do mi iras al ĉambro numero dek du per la ŝtuparo.
The elevator does not work, so I go to room number twelve by the stairs.
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