back·fillBrE/ˈbækfɪl/NAmE/ˈbækfɪl/verbpresent simple - I / you / we / theybackfillBrE/ˈbækfɪl/NAmE/ˈbækfɪl/present simple - he / she / itbackfillsBrE/ˈbækfɪlz/NAmE/ˈbækfɪlz/past simplebackfilledBrE/ˈbækfɪld/NAmE/ˈbækfɪld/past participlebackfilledBrE/ˈbækfɪld/NAmE/ˈbækfɪld/ -ing formbackfillingBrE/ˈbækfɪlɪŋ/NAmE/ˈbækfɪlɪŋ/~sthtofillaholewiththematerialthathasbeendugoutofit回填(用挖出的材料重新填回洞穴)