You need to go to the shoe repair stall. Tell him to nail the metal piece onto your shoes. Then the master workman will nail a metal piece with a half-moon shape onto the bottoms of your shoes, and that way the shoes won't slip anymore.
你要去街邊補鞋檔，話打鞋碼，師傅就會幫你打半月形嘅鞋碼喺鞋底，噉就唔會𨃩㗎喇。