Qhov kawg cov pas tuav yog cov khoom ua si nrov tshaj plaws rau chaw ua si thiab tsev kawm ntawv.

Cov menyuam hnub nyoog 6-12 nyiam ua si nws thiab txhim kho kev ua kis las.

SPIRIT tsim cov kab liab liab kawg nrog cov khoom zoo ntawm cov yeeb nkab galvanized.Qhov kev lees paub ntawm cov pas tuav yog 8-10 xyoo.

Muaj ntau ntau qhov liab tuav tuav tsim rau cov neeg siv khoom xaiv, uas tuaj yeem sib sau ua kev ywj pheej hauv av lossis ntxiv rau tag nrho cov chaw ua si.