Most of the time when the pattern gives directions for odd rows they state at the top to just knit or purl all even rows.
When working in the round, you need a marker on the needle that travels with the fabric, so that you know where rows start/end. A small round ring made of metal, plastic or even a knotted length of yarn can function as a marker. Read the pattern carefully, since apparently, the even-numbered rows all have the same pattern and it is listed somewhere on the pattern, probably in the first few instructions.
Usually on one side they are centimetres (numbered) with millimeters (marked but not numbered). On the other side there are inches (numbered) with eighths or tenths or sixteenths or even thirty-secondths (marked but not numbered).
It just means to knit (the knit stitch) for 3 rows. No increases, no decreases, no pattern stitches.
Zero, a useful number to have on the scales, will be present in the even numbered scales but not the odd numbered ones.
Even numbered roads go east/west. Odd numbered roads go north/south.
If you were born in an even numbered year, your license will expire on your birthday in an even numbered year. If you were born in an odd numbered year, your license will expire on your birthday in an odd numbered year.
East-to-west direction highways are even-numbered while north-south are odd-numbered.
18
Odd numbered interstates run north and south. Even numbered interstates run east and west
"but of you even the hairs of the head are all numbered". Recorded in Mathew 10: 30
All odd numbered highways run North/South. All even numbered highways run East/West.
Knitting is accomplished usually with pairs of needles -- knitting needles, to be exact -- and some form of spun fiber spun into a long, long length -- usually several hundred metres long, and even longer.