I suspect @blay_paul added the Japanese sentence to have one containing 切磋琢磨 for use as a dictionary example. I'm not a fan of that English sentence as a translation of the Japanese, so I'll add an alternative.
Tibzimin
Sken-d akk ticraḍAḍris n tefyar
Turagt: CC BY 2.0 FRAɣmis
Mazal ur nezmir ara ad nzeṛ ma yella tafyirt-agi tettwakkes-d deg tazwara seg tsuqilt neɣ ala.
icudd-itt iɛeggal arussin, azemz arussin
yerna-t blay_paul, 24 Yunyu 2008