firstly

adv (in giving a list) to begin with （用於列举事项）首先, 第一: The illness can develop in two ways: firstly, in cases of high blood pressure and secondly... 这种病有两种情况: 第一, 由高血压引起; 第二....

first floor, first gear, first lady, first name, first night, first of all, first offender, first officer, first or last, first refusal, first school, first-aid, first-born, first-class, first-day cover, first-footing, first-fruit, first-hand, first-rate, firsthand, firth, fiscal, fiscal year, fish, fish and chips, fish cake, fish finger (US fish stick), fish out, fish pond, fish weir, fish-eye lens, fish-farm, fish-hook, fish-kettle, fish-knife, fish-net, fish-plate, fish-slice, fisherman, fishery,